Description:_x000D_ This brake fluid tester is used to determine the moisture according to conductivity change and check the car brake oil quality, it used to test for DOT3 / DOT4 / DOT5 fluid._x000D_ _x000D_ Features:_x000D_ _x000D_ The main function of this brake fluid test pen is brake fluid quality determining. _x000D_ According to the variation of electrical conductivity to determine the moisture content of the brake fluid change. _x000D_ 5 LED lights display the percentage of moisture content in brake fluid, provides more accurate test result. _x000D_ Designed without cable connector, portable and light weight, convenient to carry and use. _x000D_ Suitable for professional use in automotive repair shops to test DOT3 / DOT4 / DOT5 liquid. _x000D_ _x000D_ Specifications:_x000D_ Condition: 100% brand new_x000D_ Material: plastic, electronic components_x000D_ Color: black_x000D_ Length: approx.155mm / 6.1in_x000D_ Width: 18mm / 0.7in_x000D_ Power Supply: 1.5V LR03 AAA battery (not included)_x000D_ LED: 5_x000D_ Net Weight: approx.29g_x000D_ Package Weight: approx.61g_x000D_ _x000D_ Package List:_x000D_ 1 * Brake Fluid Tester (Battery Not Included)_x000D_ _x000D_ Instruction:_x000D_ Unscrew the brake fluid reservoir and pull off the cap of the brake fluid tester then dip the test probes into the brake fluid until up to the plastic rim of the device._x000D_ _x000D_ Product Label Indication:_x000D_ Green: Battery OK,i.e.: No water contained in the brake fluid._x000D_ Yellow: Less than 1% of water content in the brake fluid._x000D_ Yellow / yellow: Approx.2% of water content in brake fluid._x000D_ Yellow / yellow / red: Approx.3% of water content in brake fluid. The brake fluid should be changed._x000D_ Yellow / yellow / red / red: At least 4% of water content in brake fluid. The brake fluid should be changed urgently! Extreme danger! 1The main function of this brake fluid test pen is brake fluid quality determining 2According to the variation of electrical conductivity to determine the moisture content of the brake fluid change 35 LED lights display the percentage of moisture content in brake fluid, provides more accurate test result 4Designed without cable connector, portable and light weight, convenient to carry and use 5Suitable for professional use in automotive repair shops to test DOT3 / DOT4 / DOT5 liquid