Top 10 Best refractometer in 2026

Last Updated - 6/7/2026

🏆Best Choice

$4-in-1 DEF Antifreeze Coolant Refractometer for Automobile Antifreeze System, Diesel Exhaust Fluid, Battery Acid and Windshield Washer Fluid$

aichose

4-in-1 DEF Antifreeze Coolant Refractometer for Automobile Antifreeze System, Diesel Exhaust Fluid, Battery Acid and Windshield Washer Fluid

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•Function 1: Measuring freezing point of automobile antifreeze based on ethylene glycol or propylene glycol.Measuring Range: -50 to 0 ℃.
•Function 2: Measuring specific gravity of battery acid and provide a quick reference of battery charge condition.Measuring Range:1.10 to 1.40 kg/l
•Function 3: Measuring windshield washer fluid based on ethanol or isopropyl alcohol.Measuring Range:-40 to 0 ℃
•Function 4:Measuring Urea Concentration in automobile diesel exhaust fluid (DEF).Measuring Range:30% to 35%
•Features automatic temperature compensation: makes it even easier to get fast results.

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$21.99

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aichose

3-in-1 Antifreeze Tester in Fahrenheit Scale for Checking Freezing Point and Concentration of Ethylene Glycol or Propylene Glycol Based Automobile Antifreeze Coolant, Also for Battery Acid Condition

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•Function 1: Measuring freezing point temperture of ethylene glycol or propylene glycol based automobile antifreeze coolant. Scale range: ethylene glycol base: -84°F-32°F, propylene glycol based -60°F-32°F
•Function 2: Measuring concentration of ethylene glycol or propylene glycol based automobile antifreeze coolant. Scale Range: ethylene glycol base: 0-70% propylene glycol based 0-63%
•Function 3:Measuring specific gravity of battery acid and provide a quick reference of battery charge condition. Scale Range:1.100~1.400kg/l
•Features automatic temperature compensation: makes it more convenient to use in different temperature.
•Quick and easy: Just need 2-3 drops of solution and a few seconds, you can get accurate readings. And no battery needed.

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$21.80

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$TRZ 4-in-1 Antifreeze Refractometer Ethylene Glycol, Propylene Glycol in Antifreeze Freezing Point Temperature and Concentration, AdBlue, DEF and Industrial Battery Fluid$

TRZ

TRZ 4-in-1 Antifreeze Refractometer Ethylene Glycol, Propylene Glycol in Antifreeze Freezing Point Temperature and Concentration, AdBlue, DEF and Industrial Battery Fluid

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•The models have only one unit system: °F. With the indication of the percentage we may know the freezing point of either ethylene glycol or propylene glycol based cooling systems. And they can also be used to test the concentration of ethylene glycol or propylene glycol in antifreeze Fluids.
•Ethylene Glycol: -84°F-32°F 0-70% VOL
•Propylene Glycol: -60°F-32°F 0-63% VOL
•AdBlue: urea concentration 30% - 35%
•Battery SG: 1.100-1.400sg

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$21.90

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$Antifreeze Refractometer in Fahrenheit 4 in 1 Antifreeze Tester Coolant Refractometer Ethylene Propylene Glycol Refractometer for Antifreeze System Diesel Exhaust Fluid, Battery Acid$

Hallocool

Antifreeze Refractometer in Fahrenheit 4 in 1 Antifreeze Tester Coolant Refractometer Ethylene Propylene Glycol Refractometer for Antifreeze System Diesel Exhaust Fluid, Battery Acid

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•4-in-1 Tester - Measuring Freezing of automoblie antifreeze based on ethylene glycol or propylene glycol -60℉ to 32℉. Measuring Specific Gravity of battery acid 1.10 to 1.40Kg/L. Measuring of Windshield Washer Fluid based on ethanol or isopropyl alcohol -40℉ to 32℉. Measuring Urea Concentration in automobile diesel exhauset fluid (DEF) 30% to 35%
•Display In Fahrenheit - Updated antifreeze coolant refractometer in Fahrenheit (℉) display, allow you easy to read measured results by ℉ unit, no need to units conversion and save your time
•ATC Function - Coolant refractometer Fahrenheit can automatically compensate temperature when ambient temperature changes, eliminate the deviation, you can get the accurate results fast and easier
•Easy To Use - Only need 2 or 3 drops of solution and wait for few seconds, then you get the accurate results. These antifreeze tester needs less sample solution than tradistional hydrometer and less expensive then digital refractometer
•Durable And Portable - Antifreeze coolant tester is made of aluminum and ABS rubber, non-staining, anti-rust and stury for long perfermance. Comes with durable plastic box, portable and easy to take with you

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$17.66

$19.99

-12%

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$Antifreeze Refractometer, 3-in-1 Antifreeze Coolant Tester for Checking Freezing Point, Concentration of Ethylene Glycol Propylene Glycol Based Automobile Antifreeze Coolant Condition$

WATETTY

Antifreeze Refractometer, 3-in-1 Antifreeze Coolant Tester for Checking Freezing Point, Concentration of Ethylene Glycol Propylene Glycol Based Automobile Antifreeze Coolant Condition

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•Antifreeze Coolant Tester Function 1: Measure the freezing point temperature of ethylene glycol or propylene glycol based automotive antifreeze. Scale range: glycol-based: -84°F-32°F, propylene glycol-based -60°F-32°F
•Antifreeze Coolant Tester Function Function 2: Measure the concentration of ethylene glycol or propylene glycol-based automotive antifreeze. Ratio range: glycol-based: 0-70% propylene glycol-based 0-63%
•Antifreeze Coolant Tester Function Function 3: Measure the specific gravity of battery acid and provide a quick reference of battery charging condition. Weighing range: 1.100~1.400kg
•Widely Use: Just drop 2 or 3 drops and wait for few seconds to get the accurate value. Optic lens no battery required, hold the refractometer up to the light and look scale through the eyepiece. Adjust Automatically to Compensate for Temperature, Which makes it even easier to get fast results.
•Its Easy : its easy to use, sturdy design, compact size, light weight, easy to carry around

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$17.99

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$Extech RF41 Battery Coolant & Glycol Refractometer with ATC - Measures -50 °C to 0 °C Freeze Point & Battery Acid Specific Gravity, Handheld Optical Refractometer Kit$

Extech

Extech RF41 Battery Coolant & Glycol Refractometer with ATC - Measures -50 °C to 0 °C Freeze Point & Battery Acid Specific Gravity, Handheld Optical Refractometer Kit

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•Dual-Function Measurement - Accurately reads the freeze point of propylene/ethylene glycol (-50 °C to 0 °C) and battery acid specific gravity (1.11 - 1.30) for versatile coolant and battery testing.
•Automatic Temperature Compensation (ATC) - Ensures consistent, reliable readings across varying ambient temps without manual adjustment.
•High Accuracy & Minimal Sample Needed - Requires just 2-3 drops for fast, precise measurement; features focus-adjustable prism and lens for easy reading.
•Portable & Durable Kit - Compact handheld body (~6.3 × 1.6 × 1.2 in, ~180-200 g) with eyepiece, carrying case, calibration screwdriver, pipette, and calibration solution included.
•Wide Industry Applications - Ideal for automotive and HVAC mechanics, maintenance techs, and lab professionals—streamlines glycol freeze point checks and battery health assessments. (Derived from primary features and use logic)

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$114.00

$147.51

-23%

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$Milwaukee Digital Ethylene Glycol Refractometer$

Milwaukee

Milwaukee Digital Ethylene Glycol Refractometer

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•Dual-level LCD / Automatic Temperature Compensation /Battery operation with audible Low Power indicator / Automatically turns off after 3 minutes of non-use
•Range 0 to 100% / Volume 0 to -50 °C / 32 a -58 °F / Freezing Point 0 to 80°C / 32 to 175°F Resolution 0.1% Volume 0.1°C / 0.1°F Freezing Point 0.1°C / 0.1°F Accuracy ±0.2% Volume ±0.5°C / ±1.0°F Freezing Point ±0.3°C / ±0.5°F
•Light Source Yellow LED / Measurements Time Approximately 1.5 seconds / Minimum Sample Volume 100 µL (cover prism totally) / Sample Cell SS ring and flint glass prism
•Temperature Compensation Automatic between 10 and 40°C / 50 to 104°F Case Material ABS Battery Type 1 x 9V AA (included) Battery Life 5000 reading Auto-shut off after 3 minutes of non-use

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$228.85

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$Antifreeze Refractometer,V·RESOURCING Hand-Held Anti Freeze Tester for Car Coolant Adblue Antifreeze System, Glycol Propylene,Glycol Ethylene,Battery Acid,Coolant Windshield Fluid$

V·RESOURCING

Antifreeze Refractometer,V·RESOURCING Hand-Held Anti Freeze Tester for Car Coolant Adblue Antifreeze System, Glycol Propylene,Glycol Ethylene,Battery Acid,Coolant Windshield Fluid

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•1.[ Antifreeze Refractometer ] Designed for measuring coolant and antifreeze based on ethylene glycol or propylene glycol ,battery fluid condition and screenwash antifreeze (windshield washer fluid) based on ethanol as well as on isopropyl alcohol. And check the urea concentration in AdBlue
•2.[ Measuring Range ] Battery fluid 1.10~1.40kg/l ;Propylene Glycol: -50°C -0°C ; Ethylene Glycol: -50°C -0°C ;AdBlue: 30 to 35%;Screenwash/SRF1:-40~0°C
•3.[ Easy to use ] Place 2 - 3 drops of sample onto the prism, and then look through the eyepiece for the results
•4.[ Convenient to store ] Compact in size and light in weight, packed with a plastic case, convenient to store and carry around
•5.[ Application ] This Antifreeze Refractometer Tester is a portable tool for car owners. It can be used to test freezing point of automobile antifreeze systems,battery fluid condition,battery acid, glycol, coolant.

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$14.99

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$General Tools REF401 Refractometer, Glycol and Battery Electrolyte$

General Tools

General Tools REF401 Refractometer, Glycol and Battery Electrolyte

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•For measurement of ethylene and propylene glycol as well as battery electrolyte.
•Metal body
•Cushioned eyepiece
•Rubber hand grip
•Calibration screen

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$76.50

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$ChemWorld Ethylene Refractometer and Propylene Glycol Refractometer: 32 F to -60 F$

ChemWorld

ChemWorld Ethylene Refractometer and Propylene Glycol Refractometer: 32 F to -60 F

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•Ethylene Glycol Refractometer Range: -84F to 32F
•Propylene Glycol Refractometer Range: -60F to 32F
•Ten Syringes and Screw Driver Included
•Protective Carrying Case Included

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$54.99

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