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DOT3 Brake Fluid Refractometer

Brake-Chek Digital Pocket Refractometer DOT3 Fahrenheit 13940016

$ 297.00


  • Quick, automatic digital measurements
  • Economical to operate, 10,000+ measurements on two "AAA" batteries
  • World's smallest handheld brake fluid tester
  • Test brake fluid without boiling
  • Only small sample of brake fluid needed for results
  • No messy cleanup

Check boiling point of water content of brake fluids for optimal braking power. 

Over time, brake fluids will take on water, break down, and compromise the safety of the brake system. The Digital Brake-Chek tests brake fluid in seconds - right at the calipers for the most precise measurement of brake fluid integrity. 

With the simple push of a button, the Digital Brake-Chek, the world's smallest handheld tester, will quickly and accurately provide you with critical brake fluid boiling point data. 

When water content in brake fluid increases...
1. The boiling point decreases
Fluid with a reduced boiling point can create a vapor by boiling in the wheel cylinder. Normally this could happen under adverse conditions such as braking down a long steep grade or with stuck brake pads. Under these conditions rotor temperatures can climb high enough to boil brake fluid with high water content. Stepping on the brake pedal will now only compress the vapor instead of applying force to the pad. The result is sudden brake pedal failure. DOT3 fluid with no moisture content boils at greater than 401°F (205°C) as specified by DOT Standard 116. The fluid in a 3 to 4 year old car with 3 to 4% moisture content could boil at less than 300°F (149°C). 

The dry boiling points for the brake fluid classes are:
Fluid Type: DOT3 Dry Boil Point: 401°F / 205°C
Fluid Type: DOT4 Dry Boil Point: 446°F / 230°C

2. The viscosity increases
Brake fluid must flow freely to be effective. In extreme cold weather brake fluid with high water content is very viscous, causing slow pedal response and requiring more effort. 

3. Corrosion problems can occur
Water in brake fluid can contribute to the corrosion of parts such as the steel pistons and ABS modulators. 


 Scales: DOT3
DOT3 HT (High Temperature)
DOT4 Plus
Scale Ranges: DOT3: 250°F - 500°F
DOT3HT: 250°F - 575°F
DOT4: 257°F - 527°F
DOT4 Plus: 302°F - 527°F
Calibration: Distilled Water
Automatic Temperature Compensation: 68°F
Prism: Glass
Illumination: 589nm LED
Dimensions: 2.13 x 1.06 x 3.9 inches
Power: 2 "AAA" batteries, included
Battery Life: 10,000 readings, Auto-Off Sleep Mode
Ratings: IP65 Dust Proof/Water Resistant, CE, RoHS and WEEE complaint
Warranty:  1 year against manufacturing defects. Evidence of tampering voids warranty. 


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