Universal Brake Fluid Tester Pen

  • $24.95
  • Save $12.55

Most people know about changing engine oil to avoid engine damage, but your brake fluid is even more important, to avoid brake failure. How long was it since you had your brake fluid changed? The quality of your brake fluid has a direct influence on your safety.
With this unique tool, you can determine the quality of your brake fluid. This improves your safety and saves you money, as you only need to exchange the brake fluid when you need to. Luckily, it is not expensive and easy to use.
Have peace of mind while driving by regularly testing with this handy tool.


  • Brand Name: ACARTOOL
  • Model Name: Brake Fluid Tester
  • Hardware Version: 2018
  • Software Version: Latest
  • External Testing Certification: CE
  • Electronic: No
  • Item Weight: 0.5kg
  • Item Length: 10cm
  • Item Height: 5cm
  • Item Width: 8cm
  • Material Type: plastic
  • Item Type: Electrical Testers & Test Leads
  • Special Features: Tester Car Brake Fluid
  • warranty: 1 year
  • Quality : Superior
  • Package: Standard
  • Performance: Excellent /strong and stable
  • Technical Support: Available and Timely
  • After-sale service: Perfect and convenient
  • Place of Origin: Guangdong, China (Mainland)


  • Unit Type: piece
  • Package Weight: 0.1kg (0.22lb.)
  • Package Size: 10cm x 8cm x 5cm (3.94in x 3.15in x 1.97in)


It can result in your brakes failing and causing an accident!


Note : this product comes without retail boxes, we send it in safe packaging


1, check the car brake oil quality
2,5 LED lights display the percentage of moisture content in brake fluid
3, auto power off
4, 1 LR03 AAA batteries (not included)
Five LED indicators show the test results more accurate.
Testing DOT 3, DOT4, DOT5 brake fluid
Press the switch to turn on the power, the green LED light that represents the battery properly, the green light does not shine on behalf To replace the battery
Automatic shutdown


Brake fluid detection pen is based on the change in conductivity to determine the moisture change brake fluid. It shows clearly the extent of moisture contained by the light-emitting diode, high moisture content will lead to lower boiling point, affect braking performance. Red indicates the brake fluid needs immediate replacement, green represents good condition, yellow indicates the state is acceptable but soon replaced.
  1. the green LED lights = water content in the brake fluid H2O <1.5%, brake fluid qualified
  2. the yellow LED lights = brake fluid water content H2O = 1.5% to 3%, can continue to use, test again six months later
  3. the red LED lights = water content in the brake fluid H2O> 3%, can not continue to use the brake fluid needs to be replaced
  4. Red LED: change brake fluid
  5. LED red flashing: battery replacement
  6. LED yellow: low moisture content, check again in six months
  7. LED green: brake fluid lines / cell row

Technical parameters:

Green: Battery OK, that is, brake fluid does not contain water
Green / yellow: brake oil in water content of less than 1%, better brake fluid performance, ease of use.
Green / yellow / yellow: brake oil in water content of about 2%, brake fluid can continue to use.
Green / yellow / yellow / red: brake oil in water content of about 3%, the proposed replacement of brake fluid.
Green / yellow / yellow / red / red: brake oil in water content of at least 4%, the brake fluid must be replaced immediately responsible for very dangerous.