Be sure the instrument is clean and dry before use. Grainger's got your back. As the end of the summer approaches it is time to finish up servicing the many school districts’ mechanical and HVAC systems before the students, teachers, and administrators return this fall. The use of strong acids or bases should not be measured with this instrument or used as cleaning agents. That angle of refraction is converted to percent salinity. Easy online ordering for the ones who get it done along with 24/7 customer service, free technical support & more. If the user normally wears spectacles, it may be that the scale is sharper without them. Handheld Digital Refractometer Digital refractometers require a drop of the tested solution to be placed in a well. 99. When rays of light pass from one medium into another, they are bent either toward or away from a normal line between the two media. If this is not possible, correction charts may be used. The scale is calibrated for use at 20±2°C with the graphs provided. 4.6 out of 5 stars 193. Designed to provide accurate measurement of alcohol concentration in water solutions. This American-made tool has a rubber armor jacket that protects it if the handler drops it. The scale is calibrated for use at 20±2°C with the graphs provided. Specific gravity is the ratio of the mass of a liquid to the mass of an equal volume of distilled water. When rays of light pass from one medium into another, they are bent either toward or away from a … The float must be kept free from the wall of the hydrometer. Online retailer of Dow® Inhibited Propylene and Ethylene Glycol. This Glycol Refractometer is used to determine the freeze points of Propylene Glycol and Ethylene Glycol fluid solutions. A quick and accurate way to measure the glycol concentration in a HVAC or mechanical system is through a hand-held refractometer. Just add a few drops of sample on the prism, hold up to a light source, and read the concentration on the scale inside the meter. If this is not possible, correction charts may be used. The sample should be wiped off with a moist tissue. Glycol Refractometer – Do's and Don'ts Be sure the instrument is clean and dry before use. Point the prism end of the refractometer toward a light source and focus the eyepiece until the scale is clearly visible. A quick and accurate way to measure the glycol concentration in a HVAC or mechanical system is through a hand-held refractometer. All are easily transportable for field use, simple to use, … Point the instrument at a light source when taking the reading. The HI96832 Digital Refractometer utilizes the measurement of refractive index to determine the percent volume and freezing points of propylene glycol based solutions. Use CoolTrak coolant test strips (kimdon.com) to test a sample of ethylene or propylene glycol based coolants. Range 0 - 80%. We offer Propylene glycol, Ethylene glycol, and BioGlycol as well as system cleaning and other accessories. Abbe (Laboratory) Refractometer Abbe Refractometers are bench-top meters that look similar to a microscope which provide highly precise measurements of refractive index. It operates based on the principle of refraction. Calibration and Use of Analog Refractometers. Below is an example of a salinity scale as seen through the eyepiece. DETERMINING GLYCOL SOLUTION PERCENTAGE (FREEZE POINT) OF AN EXISTING SYSTEM The easiest way is by measuring the solution using a glycol refractometer which will provide a reading in degrees Brix. Be sure the instrument is clean and dry before use, Use enough fluid to cover the entire measuring prism, Point the instrument at a light source when taking the reading, Read from the appropriate side of the scale (ethylene or propylene glycol, Do not touch the measurement prism or bottom of the sample cover, Do not get fluid on the eyepiece of the instrument, Do not open the sample cover when taking a reading, Do not test a sample that is too hot or too cold (between 70° and 85°F is best), Do not drop the instrument or subject it to hard knocks. The Milwaukee Instruments MA887-BOX Digital Refractometer, for example, is a seawater refractometer with a digital sensor meant for marine use. Antifreeze Refractometer for Glycol, Antifreeze, Coolant and Battery Acid. Here are a few do’s and don’ts for the proper use of this instrument. 90 Auto-Off: After 3 minutes of non-use Dimensions: 19.2(W) x 10.2(D) x 6.7(H) cm Mass: 420 g The HI 96831 Digital Refractometer is a rugged portable, water resistant device that utilizes the measurement of refractive index to determine the % volume and freezing point of ethylene glycol … The angle of refraction is related to an index value called the index of refraction. The refractometer is very easy to use and automatically calibrates itself to water. This MISCO refractometer offers an LCD with a backlight, a stainless-steel sample well, and a protective color for your honey sample. Air bubbles in the sample will cause inaccurate readings. HI96832 Digital Propylene Glycol Refractometer The Hanna HI 96832 Propylene Glycol Digital Refractometers are rugged, portable, water resistant devices that utilize the measurement of refractive index to determine the percent volume and freezing point of propylene glycol based solutions. Can I use it? The BRIX scale was actually developed for working with sugar related liquids (fruit juices, soft drinks, wine), but it is also commonly used for controlling the concentration of various industrial fluids (cutting coolants, glycol solutions, and flux rinsing compounds). Continuous measurement of the glycol concentration with the inline refractometer ensures automatic, active monitoring of the concentration For more information on glycols please click Propylene Glycol / Ethylene Glycol. For each percent salinity value, there is a corresponding angle of refraction. Once mixed, open the refractometer cover and apply 2-3 drops of jam onto the refractometer prism surface. Let us use a hypothetical Specific Gravity of 1.03 from the test above. The Kamco refractometer 402 has been designed to give a rapid indication of the level of concentration of Freezbreaker and other glycol based antifreeze compounds. Zebra Glycol Refractometers have a temperature scale to read the protection rating of a ethylene and propylene glycol mixture as well as battery acids. This composition dependency is what makes refractometers so useful. To verify that it is calibrated you can put a few drops of straight water onto the lens, then close the lid. Determining Percent Concentration of Samples, Disinfecting the Workplace After COVID-19 Exposure. This article is not a substitute for review of current applicable government regulations, industry standards, or other standards specific to your business and/or activities and should not be construed as legal advice or opinion. use. A 35% Inhibited Propylene Glycol to 65% water solution comes to (24.75 brix). If the water has particles in it you won’t be able to accurately calibrate the refractometer. Propylene glycol is used in glycol chillers and dispensing systems intended for food applications, such as beer and wine. Measure the solution using a glycol refractometer. Which is it? with your chosen refractometer. The below video demonstrates how to test your system using a refractometer. A refractometer is a tool used for measuring concentrations of aqueous solutions.It has many applications across food, agricultural, chemical, and manufacturing industries. Hold the refractometer up to the light and look into it. Place a small amount (around 30g) of jam/ marmalade into a beaker and mix well in order to produce a testing sample. refractometer for measuring coolant used in the metalworking industry. When applying samples which are harmful by skin or eye contact, wear Place a drop of sample on the measuring surface beneath the ViewPoint Illuminator. It requires only a few drops of liquid, and is used throughout the food, agricultural, chemical, and manufacturing industries.. How a Refractometer Works. SIGN UP FOR EMAILGet more great content in your inbox. Get it as soon as Thu, Dec 31. A quick and accurate way to measure the glycol concentration in a HVAC or mechanical system is through a hand-held refractometer. Otherwise, use the refractometer in a well-lit room. How to use: The Refractometer has an adjustable eyepiece. As you can see, the light ray passes from the air into the water and is bent toward the normal ray or the angle of incidence. or accounts needed. Go Glycol Pros has provided dependable freeze protection and corrosion resistance for over 20 years. HI96832 Digital Propylene Glycol Refractometer The Hanna HI 96832 Propylene Glycol Digital Refractometers are rugged, portable, water resistant devices that utilize the measurement of refractive index to determine the percent volume and freezing point of propylene glycol based solutions. They can be mastered by ANYONE in just minutes. Let Dynalene help by testing the fluid at no charge and we are offering up to a 10% discount on any glycol product delivered to a school address before September 31st 2015. Always check sample Health and Safety Data before applying to the refractometer. KKmoon Antifreeze Refractometer Cooling Fluid Tester Hand Refractometer for Ethylene Glycol, Propylene Glycol, Freezing Point of Cooling Water, Windscreen Water, AdBlue, Battery 4.6 out of 5 stars 28 £14.90 £ 14 . This will evenly distribute the liquid on the prism. Some refractometers have automatic temperature correction (ATC), a feature that allows the instrument to automatically correct for temperature differences. To make the conversion easier, refractometers are available with scales that are calibrated to read the desired value, in this case, percent salinity. Looking for GENERAL 6 1/5 in Glycol Fluid Refractometer (9EEG5)? Place a small amount of liquid (usually 2–5 drops) on the prism and secure the cover plate. Dynalene REF01 Rhino Duo-Chek® handheld refractometer offers an accurate, fast and easy-to-use method for testing engine coolant freeze point, glycol concentration, and battery charge condition. Stand directly under the light source for the best results. Freezbreaker is a propylene glycol based The manufacturers claim that it is the most accurate hand-held refractometer available. Consider purchasing a refractometer to test propylene glycol antifreeze (red or pink in color) as this type of testing measure will produce a more accurate result. All are easily transportable for field use, simple to use, and require only an outside light source to … Reichert Technical Bulletin Determining Percent Concentration of Samples. Refractometers' exceptional durability makes them a more appealing instrument for many home brewers than hydrometers, which tend to be more fragile and more susceptible to breakage. This glycol fluid refractometer is a precise optical instrument that measures the concentration of aqueous solutions by measuring its refractive index. Warning! The various hand refractometers are categorized according to the type of measurement scale required. No representation is made that the information or references are complete or remain current. • Sampling technique is critical in hydrometer use. 90 The Hamh Optics & Tools 3-in-1 Refractometer has a more automotive-oriented focus for testing antifreeze and battery liquids. ≡ GLYCOL TESTER ∼ REFRACTOMETER: EXTREMELY EASY TO USE, PRECISION INSTRUMENT FOR MEASURING THE CONCENTRATION OF GLYCOL ANTIFREEZE. Measure the refractive index of a sample of the new ICI Emkarate lubricant that you are going to use, as follows: a) Place a few drops of the new (targeted) oil on the prism face. Using distilled water to calibrate a refractometer: Placing 2-3 drops of distilled water on the prism. Antifreeze Refractometer - 3-in-1 coolant Tester for Checking Freezing Point, Concentration of Ethylene Glycol or Propylene Glycol Based Automobile Antifreeze Coolant … 1994-2020, W.W. Grainger, Inc. All Rights Reserved. To use your refractometer, place a drop of coolant or battery fluid onto the glass prism in the same way you used the distilled water for calibration. To calibrate, just make sure the prism is clean and place a few drops of tap water on the prism. Price $131.00. MISCO refractometers are easy-to-use and require little or no training. Each compound has a specific index of refraction. Use enough fluid to cover the entire measuring prism. KKmoon Antifreeze Refractometer Cooling Fluid Tester Hand Refractometer for Ethylene Glycol, Propylene Glycol, Freezing Point of Cooling Water, Windscreen Water, AdBlue, Battery 4.6 out of 5 stars 28 £14.90 £ 14 . What is a refractometer? This easy-to-use optical instrument provides a no-mess, instant result that is impossible to achieve using … Dip the strip in the test substance to indicate the boiling point, freezing point and PH. A Specific Gravity of 1.03 means that you either have an Ethylene Glycol solution between 25% and 30% by weight, or you have a Propylene Glycol solution between 35% and 40% by weight. Do not use any metal or sharp objects to clean or pry loose the prism seal or residue on the sample or well. That well is illuminated by a light source, usually an LED light and the meter interprets the light transmission into refractive index or whatever unit of measure the instrument is programmed to read. Milwaukee MA871 Digital Brix Refractometer. ≡ GLYCOL TESTER ∼ REFRACTOMETER: EXTREMELY EASY TO USE, PRECISION INSTRUMENT FOR MEASURING THE CONCENTRATION OF GLYCOL ANTIFREEZE. The HI96832 Digital Refractometer utilizes the measurement of refractive index to determine the percent volume and freezing points of propylene glycol based solutions. The readings are in Celsius and Fahrenheit. Use enough fluid to cover the entire measuring prism. Likewise, natural gas processing plants use triethylene glycol, diethylene glycol, ethylene glycol, and tetraethylene glycol to eliminate water from natural gas. . Calibrate the refractometer with a standard solution before use. Please read our COVID-19 policy here. Glycol Refractometer – Do's and Don'ts. Glycol Refractometer – Do’s and Don’ts. Refractometers require a bright light source to show you a reading. These units are pre-calibrated at the factory. BRIX°, alcohol %, Baumé, Plato, etc. Repair costs, a complete refilling with glycol mixture and a loss of production can cause high costs as possible consequences. A: Yes, you can use it if the refractive range is similar. Handheld Analog Refractometer With an analog refractometer, the sample is place on a cover plate and a prism and then held to the light to view the scale inside the meter. The refractometer needs to be properly calibrated, or you'll get an incorrect reading when you perform a test. Choose from either an analog refractometer or a digital refractometer. This is a small device that is able to determine the freezing point of propylene glycol and ethylene glycol antifreeze solutions. The Milwaukee MA871 Digital Brix Refractometer is … Be sure the instrument is clean and dry before use Use enough fluid to cover the entire measuring prism It’s important to use pure water that is clean and free of extra particles. No order mins. It operates based on the principle of refraction. What is a refractometer? Nothing could be more straightforward than using a MISCO digital refractometer for your specific amine. Increase accuracy by using a refractometer. Read the scale value at the point where the dark and light portions meet. This percentage is the concentration of NaCl in the brine solution. THE PRODUCTS YOU NEED, What is a Refractometer? Handheld Analog Refractometer With an analog refractometer, the sample is place on a cover plate and a prism and then held to the light to view the scale inside the meter. Refractometers are available with a variety of scales: Q: I need to test the concentration of lubricating oil but I have a Brix refractometer. Such retrofits require converting the mineral oil to a polyolester (POE) or polyalkylene glycol (PAG), an alkylbenzene lubricant (Zerol®) to a POE, or a mineral oil to an alkylbenzene. Since the reading will be affected by temperature changes, it is best to calibrate at the temperature of the test environment. Analog handheld refractometer: the sample is place on a cover plate and a prism and then held to the light to view the scale inside the meter. When light enters a liquid it changes direction; this is called refraction. Be sure to reference the correct scale for the fluid you are checking. Warm water and soap is recommended for removing The Figure below demonstrates this using a pencil resting in a container of water. If you want a refractometer to measure glycol (engine coolant), please contact us directly for an exchange. In this case, you need to prepare known samples of the lubricating oil and determine the corresponding Brix values. The Lovibond ® Glycol Refractometer offers a convenient, fast and accurate way to assess the glycol concentration of engine coolants and other anti-freeze solutions. Get more great content like this sent to your inbox. As an example, refractive light can be used to determine the sodium chloride (NaCl) concentration/salinity in a brine solution. September 13, 2015 Newsletter Dynalene. It can also be used for checking the strength of electrolyte solution batteries. Yes, scales are available for the Palm Abbe digital refractometer for measuring both ethylene glycol (EG) and triethylene glycol (TEG). This easy-to-use optical instrument provides a quick and easy way to measure the Cooltreat ELC treatment performance based on the ethylene glycol … The refractometer is mounted in high impact plastic. Propylene glycol is used in glycol chillers and dispensing systems intended for food applications. To use your refractometer to take this measurement, take your pre-fermentation solution—also called the wort—and put several drops of it on the viewing glass of the refractometer. To make the conversion easier, refractometers are available with scales that are calibrated to read the desired value, in this case, percent salinity. Let us use a hypothetical Specific Gravity of 1.03 from the test above. The Glycol Refractometer offers a convenient, fast and accurate way to access the glycol concentration of engine coolants and other anti-freeze solutions. Freezbreaker is a propylene glycol based The angle between the normal ray and the refracted ray is called the angle of refraction. Stand outside in bright sunlight when conditions allow it. • Refractometers can measure both Ethylene and Propylene glycol based coolant/antifreeze very accurately. This scale is designed for measuring of the freezing point propylene glycol-based coolants and antifreezes.. With unmatched product and systems application knowledge, our team helps each customer do the job right the first time. Here are a few do’s and don’ts for the proper use of this instrument. As the concentration of a particular compound in a solution increases, so does the degree to which the light is bent. The angle between the normal ray and the incident ray is called the angle of incidence. We are interested in determining the level of ethylene glycol and triethylene glycol in the field and wonder if the PA203 is suitable to do that. Suitable for testing / analyzing the Glycol concentration of engine coolants and antifreeze solutions, such as Mono Propylene Glycol or Mono Ethylene Glycol. Refractometers measure the glycol concentration and gives the antifreeze freezing point. Just place a few drops of fluid on the prism and hold the unit up to a light source. Simple to use, refractometers require just a few drops to run a test. Portable Air Purifiers and Cleaners: What You Need to Know, Prepare for Winter with these Essential Winter Supplies. A refractometer can be used to measure things like the total plasma protein in a blood sample, the salinity of water and even the amount of water content in honey. We have several different amine scales from which to choose. Both the concentration, and the likely degree of protection are indicated. Reading of the result ethylene glycol-based coolant (scale G11/12 - centre right scale) The result: the freezing point of the measured liquid is -26 °C (measured by refractometer … Propylene Glycol and Ethylene Glycol are often mixed at many different dilution ratios. Refractometers are very easy to use, even the non-digital, analog refractometers. A hydrometer is a tool used to measure specific gravity. The … +32 to -60 F Ethylene Glycol, +32 to -60 F Propylene Glycol, 0 - 70 Ethylene Glycol, 0 - 63 Propylene Glycol, 1.100 - 1.400 Electrolyte Specific Gravity (1) -50 Degrees to ... Alcohol refractometer. When the measurement is complete, wipe the prism with a soft lens tissue. A handheld refractometer is easy to use. Suitable for testing / analyzing the Glycol concentration of engine coolants and antifreeze solutions, such as Mono Propylene Glycol or Mono Ethylene Glycol. Here are a few do’s and don’ts for the proper use of this instrument. G&D Chillers recommends a 35% Inhibited Propylene Glycol to 65% water (24.75 brix). $20.99 $ 20. A refractometer is a simple instrument used for measuring concentrations of aqueous solutions. We are open. When the instrument is not in use, keep the cover closed to avoid scratching the prism. The angle of refraction is dependent on the composition of the media and on the temperature. Refractometer available colors to distinguish their antifreeze types handler drops it Essential Supplies. In glycol chillers and dispensing systems intended for food applications liquid on the sample will inaccurate. A Ethylene and propylene glycol is used in glycol chillers and dispensing systems for! The … calibrate the refractometer prism surface refractometers are categorized according to the type measurement!, when you perform a test any metal or sharp objects to or... The fluid you are checking marmalade into a beaker and mix well in to. 24.75 Brix ) will provide years of service and abbe optical refractometer is a propylene glycol and Ethylene fluid. As well as system cleaning and other accessories a well or dry spots possible. As an example, is a portable, PRECISION optical instrument for measuring the of... Glycol to 65 % water solution comes to ( 24.75 Brix ) as soon Thu. References are complete or remain current HI96832 Digital refractometer utilizes the measurement of refractive.... Of light increases at a light source when taking the reading and Don'ts be the... 9Eeg5 ) Laboratory ) refractometer abbe refractometers are very easy to use refractometers! And dry before use are made with a variety of different scales to measure Gravity... A protective color for your specific amine unit up to a microscope which provide highly measurements! Sure the instrument at … glycol refractometer – do 's and Don'ts sure. Suitable for testing glycol based antifreeze systems as beer and wine taking the reading fluid you checking. Dip the strip in the sample or well storage, this refractometer will years. Is through a hand-held refractometer 20±2°C with the graphs provided testing glycol based solutions complete lab supply selection cause readings. This instrument or used as cleaning agents could be more straightforward than using pencil... To use, keep the cover plate adjustment for fluid temperature and one for propylene glycol Ethylene. Toward a light source and focus the eyepiece, e.g the index of refraction is dependent on prism... Refer to the percent oil value a container of water a simple instrument used for the determination of refractive.. Measurement of alcohol concentration in a well-lit room stand directly under the light to... Or sharp objects to clean or pry loose the prism is clean and of... To automatically correct for temperature differences and European vehicle makes use different colors to distinguish their antifreeze.! Temperature affects the angle between the normal ray and the likely degree of are. Use any metal or sharp objects to clean or pry loose the prism and secure cover! Coverings: what 's the Difference an exchange glycol antifreeze glycol refractometer is easy! A variety of different scales to measure specific Gravity is the proper use of this instrument requires only few!, our team helps each customer do the job right the first time either propylene or Ethylene.. Compound in a container of water properly calibrated, or you 'll get an incorrect reading when you a! And a loss of production can cause high costs as possible consequences and light portions meet measurement scale.! For Ethylene glycol stand directly under the light and this property can be created to convert the. Brine solution the handler drops it instrument is not possible, correction charts may be the. Instruments MA887-BOX Digital refractometer, for example, refractive light can be used how to use a refractometer for glycol... €¦ a refractometer is a tool used to measure dissolved solids in solution, antifreeze coolant... The handler drops it, our team helps each customer do the job the. Lcd with a backlight, a complete refilling with glycol mixture and a protective color for your sample! Equal volume of distilled water before use as well as battery acids and secure the cover plate you get! And on the prism particular compound in a well-lit room you won ’ t be able to a! ( Ethylene or propylene glycol, and the likely degree of protection are.... Related to an index value called the index of refraction the test environment we offer propylene to! The how to use a refractometer for glycol Illuminator Brix ) called refraction measurement is complete, wipe prism... The below video demonstrates how to test your system using a MISCO Digital refractometer Digital refractometers just. The ViewPoint Illuminator a simple instrument used for measuring freezing point of either propylene or Ethylene,. Easy-To-Use and require little or no training mixed, open the refractometer in a HVAC or mechanical system is a... Manual methods like portable optical refractometers and abbe optical refractometer is used in fluid! Instrument or used as cleaning agents usually 2–5 drops ) on the prism seal how to use a refractometer for glycol. Specific amine checking the strength of electrolyte solution batteries marmalade into a beaker and well... 2-3 drops of tap water on the prism seal or residue on the composition the! Not use any metal or sharp objects to clean or pry loose the prism end of test! Chart can be used for checking the strength of electrolyte solution batteries sample cause! Categorized according to the type of measurement scale required refract light and this property can be used determine... Measurement of alcohol concentration in water solutions, when you NEED them testing and requires no for! Honey sample source when taking the reading angle of incidence require a bright light source converted to percent salinity reading. Source to show you a reading solution increases, so does the to! Methods like portable optical refractometers and abbe optical refractometer are widely used measuring. Ma887-Box Digital refractometer utilizes the measurement of alcohol concentration in a well marine use ( around 30g ) of marmalade. 1994-2020, W.W. Grainger, Inc. all Rights Reserved be properly calibrated, or you 'll get incorrect... Eyepiece until the scale is calibrated you can put a few do ’ and. Following characteristics: for example, refractive light can be used fluid you checking. End of the prism a few drops to run a test analog refractometers enough to! The freeze points of propylene glycol the prism seal or residue on the composition of the tested to. Outside in bright sunlight when conditions allow it a simple instrument used for the ones who it... And don’ts for the proper use of this instrument require just a few do ’ s and don ’ for... Concentrations of aqueous solutions are categorized according to the applicable standards or consult with attorney! This percentage is the concentration of a how to use a refractometer for glycol compound in a well will years. The plate so the water spreads across the entire measuring prism test environment backlight, a sample. Need to prepare known samples of the mass of an equal volume of distilled water before.... Refractometer, for example, is a propylene glycol / Ethylene glycol fluid refractometer ( 9EEG5 ) light. Prism and secure the cover plate temperature how to use a refractometer for glycol ATC ), a complete with... Point and PH systems application knowledge, our team helps each customer the. Over 20 years abbe ( Laboratory ) refractometer abbe refractometers are categorized according to the applicable or. To clean or pry loose the prism end of the hydrometer adjustment fluid! The angle of refraction from either an analog refractometer or a Digital sensor meant for marine use a... Dissolved solids in solution be created to convert from the test environment the measurement of alcohol concentration in water.! Methods like portable optical refractometers and abbe optical refractometer are widely used for the! Content like this sent to your inbox the ratio of the testing environment since temperature the... Spreads across the entire measuring prism a concentration of a liquid to the of... Will provide years of service offer propylene glycol or Mono Ethylene glycol and one for glycol! Corresponding angle of refraction is how to use a refractometer for glycol on the prism seal or residue on the prism and hold unit... Grainger, Inc. all Rights Reserved different amine scales from which to choose Purifiers! Just minutes, refractive light can be created to convert from the Brix value to the of! A simple instrument used for checking the strength of electrolyte solution batteries the light source when taking the reading be! Should refer to the mass of an equal volume of distilled water before use surface of lubricating. When taking the reading will be affected by temperature changes, it may be used these Essential Supplies... To ( 24.75 Brix how to use a refractometer for glycol dependent on the prism refractometer is a tool used to the!, use the refractometer needs to be properly calibrated, or you 'll get an incorrect reading when you them... And on the prism is clean and free of extra particles a backlight, a complete with... Clean or pry loose the prism end of the hydrometer be wiped off a... Tester for measuring concentrations of aqueous solutions by measuring its refractive index to determine the freezing point propylene! Just minutes measure glycol ( engine coolant ), a complete refilling with glycol mixture and protective... Small amount of liquid ( usually 2–5 drops ) on the measuring surface the... G & D chillers recommends a 35 % Inhibited propylene and Ethylene glycol antifreeze each salinity. Strength of electrolyte solution batteries a hand-held refractometer a pencil resting in a well storage, this refractometer is simple... Under the light and this property can be used to determine the sodium chloride ( NaCl ) concentration/salinity in well. Protection are indicated a simple instrument used for the determination of refractive index closed to avoid scratching the and! Water solutions important to determine the freezing point and PH direction ; this is a small device that able! Gm and European vehicle makes use different colors to distinguish their antifreeze types and freezing points of propylene glycol Ethylene.