Brake Fluid Tester Pen Diagnostic Tool DOT 3 DOT 4 5.1 Oil Analyzer 2 PC
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.