Brake Fluid Liquid Tester Pen, DOT 3 DOT 4 DOT 5.1 Brake Diagnostic Testing Pen Tool, Brake Fluid Liquid Oil Analyzer with 5 LED Indicators, Universal Car Accessories (1 PCS). Second, press the button for power on, green LED will light up.
Brake Fluid Liquid Tester Pen, DOT 3 DOT 4 DOT 5.1 Brake Diagnostic Testing Pen Tool, Brake Fluid Liquid Oil Analyzer with 5 LED Indicators, Universal Car Accessories (2 PCS). Second, press the button for power on, green LED will light up.
Second, press the button for power on, green LED will light up. Third, insert the tester into reservoir for one second, then the test result will be correctly indicated by LED. Finally, repress the button for power off.