As the upgraded model of V200/V200Pro, V500 power circuit probe tester combines the functions of circuit tester, relay tester, oscilloscope, and multimeter into one tool, totally for troubleshooting any DC 9-30V auto electrical issues. It realizes multiple functions: ✅Fuel Injector Test,✅Activate Components,✅AC/DC Voltage/Diode/Resistance Test,✅Polarity Test,✅Continuity/Signal Circuit Test,✅Check Poor Ground,✅Relay/ Fuse/Trailer Light Test,✅Power Supply.