The Combi tester supplies the components or assemblies that are tested with voltage. Thus, e.g. polarity and continuity tests or component tests are possible. The toggle switch enables switching to positive or negative voltage, this is represented by the LED lighting up green or red. It is a multifunction tester with one-hand operation. It is possible to test electrical 6 to 24 volt systems on cars, trucks and motorcycles. The built-in LED lamp illuminates the work areas. Troubleshooting is possible by applying positive or negative potential. This potential is displayed via 2 different colored LEDs GREEN/RED. An automatic shutdown happens from 10A load. Also equipped with a continuity tester with an optical signal.