• Quickly and conveniently to check the quality of the brake fluid, read the results in seconds and let you know it the brake fluid need to be change or not. Keep safe driving.
  • Easy to operate this brake fluid test pen, press the button and insert the tester into reservoir for one second when the green LED on.
  • 5 LED indicates you the test result and tells you brake fluid quality, it is convenient to know if the brake fluid is healthy or not.
  • Battery: 1 x AAA/1.5V (not included). When the green LED doesn’t light up, it means the battery has run out of power and need to replace a new battery.
  • Attention: wash the test probe with tab water after every use.