COGEEK Car Detector Brake Fluid Tester Pen 5 LED Auto Vehicle Automotive Testing Tool Diagnostic Tools Electronic Pen for DOT3/DOT4

Lights that indicate 0% indicate that the battery doesn't need replacing. Lights that indicate 1% means that the brake oil has a moisture content of less than 1%, the fluid is easy to use, and it has a good performance. Brake fluid can be continued to be used with a moisture content less than 2%. A moisture content less than 3% is acceptable for replacing brake fluid. A 2% light indicates that brake oil contains less than 2% moisture. This light indicates that at 4% light, brake oil has a moisture content less than 4%, and should be replaced as soon as possible.

Devin Perez

| Sep 05, 2020

The item was received before the time frame was agreed upon, worked perfectly and I am very satisfied with it. After two years and 43,000 miles, my car's brake fluid is still extraordinarily good. I was advised to replace the brake fluid when my car had less than 10,000 miles. Now, after two years and 43,000 miles, I am confident that it is still quite.

Clark Jacobs

| Feb 04, 2021