Function This injector tester can be used to help identify stuck, leaked or burned out conditions,it uses 12V vehicle battery for power. It can work with any fuel preure tester, easily to clean most car motorcycle fuel injectors. Specification Power Supply: 12V Car BatterySize: 125*75*25 mmMaterial Type:Plastic and Metal Operation Instruction Turn off the vehicle;s engineConnect Black / Red Clip to the Negative / Positive terminal of batteryConnect pulse output terminal to the fuel injectorPre the SELECT key to select the desiredpulse mode,and use knob to turn up or down the Frequency or widthPre the STARTkey, the tester will output pulse to the injector, and then the pulse signalindicator will light as indication Large LED display/4 Pulse Mode Mode 1: the tester outputs 1 pulse, whose pulse width is about 255msMode 2: the tester outputs 50 pulse, every pulse;s pulse width is about 7msMode 3: the tester outputs 100 pulse, every pulse;s pulse width is about 3.5msMode 4: the tester outputs pulse continuously at the rate of 50 pulses per about 1450ms, every pulse;s pulse width is about 7m It will help us clean and test the injectors of gasoline cars. Note Gasoline engines only, not for diesel engines1. Due to the different display and lighting effects, the actual color of the project may be slightly different from the color shown on the picture.2. Due to manual measurement, please allow 1-3cm measurement deviation.