5 LEDs Mini Auto Diagnostic Brakes Test Pen Portable Vehicle Automatic Brake-Fluid Tester for DOT3 DOT4 DOT5

Features:
Portable and light weight, easy and convenient to carry.
Easy operation, just put the tester into the reservoir for a while and then the results will be correctly indicated by LEDs.
Equipped with 5 LEDs to indicate the percentage of water in the brake fluid.
Green light replace the battery is fully recharged or there is no water in the brakeoil; yellow light indicates that 1% -2% water content in the brakeoil; and red light indicates that the water content is higher than 3%.
Please change the brakefluid if the percentage is more than 3%.
It can be used as a suitable digital brake fluid tester to determine the quality of brakefluid.