Fuel injector tester for DIY diagnosis and cleaning with 12V/5V switch 1、This instrument can help you diagnose injector problems and can be used to test injectors one by one or two at the same time to help confirm sticking, leaking, damage or burnout conditions. 2、Output power: 12V \u0026 5V switchable, includes 2 pairs connector. It has 2 output voltage levels and 4 pulse signal output modes. Users can choose any one according to their needs. 3、It uses the 12V battery on the vehicle or an external DC 12V (recommended at least 1.5A) power adapter as the power supply to work continuously. 4、Input short-circuit conservation function. Mode helps identify good and bad injectors with the engine off. This instrument can be used with any fuel pressure tester. 5、Selectable activation modes: continuous, short medium and long switching outputs. The output wire is made of silica gel, which has better high and low temperature characteristics.