The KZYEE KM10 Power Scan kit is the most revolutionary circuit tester to date, which works off of 12-24 Volt sources, featuring voltmeter, test light, built-in flashlight, short circuit indicator, relay/component tester, continuity tester, and bad ground indicator, the power scan is indeed the ultimate in power and affordability, allowing users to check circuitry in one single step. An absolute must for every technician who is looking for a fast and accurate solution to electrical systems diagnostics.