Brake Fluid Refractometer - Brake Fluid Scales - Percent Water & Boiling Point °F - MISCO DOT3 Refractometer

Quick Overview

Fahrenheit model – The MISCO Palm Abbe Brake Fluid Refractometer is a precision digital instrument designed for measuring the water content, and estimating the boiling point, of DOT3 brake fluids. It only takes two drops of brake fluid to get an accurate indication of water content or boiling point in only seconds. Brake fluid may be measured from the master cylinder or from each of the wheel cylinders.

Product ID: PA202X-061-062
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Accessory List

MISCO Palm Abbe Digital Handheld Refractometer

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  • Apply Sample to Refractometer.
  • Close Refractometer Evaporation Cover.
  • Press GO button to Start Refractometer Reading.
  • Read Refractometer LCD Display.
  • Clean Refractometer Well.

Additional Information

Scale 1 061
Scale 2 062
Scale 3 No
Scale 4 No
Scale 5 No
Optic Material Sapphire
Detector Elements 1,024
Well/ Sample Area Material Stainless Steel
Evaporation/ Sample Cover Yes
Country of Origin USA
Light Source Precision LED @ 589.3 nm
Display Type LCD
Display Characters 24 Characters x 2 Lines
Display Backlight Yes
Display Language Russian, English, Spanish, German, French
Temperature Control Method Auto Temp. Compensation
Temperature Control Basis Other
Temperature Range 0 to 50 °C (32 to 122 °F)
Power Source 2 AAA Batteries
Battery Life 5000+ Readings
Dimensions 145 x 75 x 37 mm (5.7 x 2.95 x 1.46 in.)
Weight 250 grams (8.8 Oz.)
User Programmable Factory Reprogrammable, Options/Settings, Select Scale
User Calibration Points 2
Body Color BLUE
Body Material Plastic
Water Resistance IP64 - Splashing Water
Error Codes Text-Based
Approvals and Certifications CE

MISCO DOT3 Brake Fluid Tester - Measure Brake Fluid Water Content and Estimate Boiling Point


The MISCO Palm Abbe Digital Brake Fluid Refractometer is a fourth generation digital refractometer designed for directly measuring water content, and estimating the boiling point of Standard DOT3 brake fluids. It only takes one or two drops of brake fluid to get an instant, accurate indication of percent water content and an estimate of it's boiling point.


As part of the regular maintenance interval, many automobile manufacturers recommend regular brake fluid inspection. However, there was never an easy, inexpensive means for testing it; until now. A  Brake Fluid Refractometer represents the most accurate field testing means available for determining the water content and estimating the boiling point of automotive brake fluids.


No Brakes - The Dangers of High Water Content in Brake Fluid:

A dangerous condition exists when brake fluid boils in the braking system; it can feel like air trapped in the lines when braking. In extreme cases the driver may be able to push the brake pedal completely to the floor without slowing or stopping the vehicle. In colder climates, brake fluid with high water content becomes very thick, which can also cause slow pedal response or difficulty braking. Also, as the water content in brake fluid increases, it will become more corrosive to steel pistons and the ABS modulator.


Easy To Use:       


Place a drop of brake fluid from the master cylinder or wheel cylinder on the measuring surface, close the sample cover, allow a brief period of time for the temperature to stabilize, and press the button.


Even New Cars Contain Water in Their Brake Fluid!

It is well know that automotive brake fluid is “Hygroscopic.” This means that in a relatively short period of time, brake fluid will absorb moisture directly from the air; even in a sealed braking system.


The Society of Automotive Engineers (SAE) conducted a recent study of automotive brake fluid. They found that an average one-year-old car had 2% moisture in its brake fluid. Randomly tested cars in the U.S., with an average age of eight years, showed an average water content of greater than 2 ½%. Of these cars, 25% had a dangerously high water content of 4% or more.


The Result is Catastrophic Brake Failure!

Brake fluid with high water content has a reduced boiling point. This means that the brake fluid will boil in the wheel cylinder at a lower temperature than the braking system was designed for. When traveling down a steep grade, towing a trailer, or in the event a brake pad becomes stuck against a rotor, brake fluid temperature can increase high enough to boil if it contains enough water. Stepping on the brake pedal will now only compress the vapor instead of applying force to the pad – the result is sudden brake failure.


Brake Fluid's Dirty Little Secret:

DOT Standard 116 requires that DOT3 brake fluid, with no moisture content, will only boil at temperatures above 400 °F (205 °C). The fluid in a 3-4 year old car with 3-4% water content in the brake fluid could boil at less than 300 °F (149 °C). How much water is too much? When should brake fluid be changed? Click here for a handy guide to brake fluid water content: When should brake fluid be changed?

Key Features Only MISCO Offers
  • Sapphire Optics
  • 1,024 Element Detector Array
  • Large 24-Character LCD
  • Display indicates Unit of Measure Name & Value
  • Display Backlight
  • Stainless Steel Sample Well
  • Protective Evaporation Cover
  • Made in the USA
  • Optional - Rubber Armor Jacket

Build Your Own Refractometer

Our Build-Your-Own Refractometer section allows you to design a custom refractometer to your exact specifications. First, select the measurement scales. Next, add options and then accessories to your design. Finally, you can print a custom quote or order immediately. TRY IT NOW!


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Contact MISCO

6275 Cochran Road, Solon OH 44139

Toll Free 866-831-1999

Phone 440-349-1500 

Fax 440-349-1511