ALLOSUN EM276 Fuel Injector Tester Operates injectors individually to diagnose fuel delivery problems on petrol vehicles with Electronic fuel injection Works with engine off and pulse timer may be used with fuel pressure gauge Large LED display/4 pulse modes test lead: 415cm/ 163 inches It can work with any fuel pressure tester please Note: gasoline car only, not the diesel engine Powered by vehicle's 12V battery It uses 12V vehicle battery for power. It has 4 pulse modes, the continuous mode (mode 4) helps identify good or bad injector. The mode lock feature ensures test condition uniformity. It can work with any fuel pressure tester. Power Supply:12V vehicle battery Operation Environment:0-40C,relative humidity &lt; 80% Storage Environment:-10C ~50C, relative humidity&lt;85% Test Cable Length: 41.5cm/ 16.3 inches Product Size:147x82x29mm 1.Turn off the vehicles engine. 2. Connect the black clip to the negative terminal of the vehicle battery, connect the red clip to the positive terminal of the battery. 3.Locate the fuel injector which you want to test, then remove the electrical cable from this injector and connect the testers two pulse output terminals to the electrical connector of this injector. 4.Press the Mode Set key to select the desired pulse mode, the display shows the current pulse mode. 5. After you have selected the desired pulse mode, press the Pulse key. The tester outputs pulse(s) to the injector under test, the pulse signal indicator will light as indication.