For use on 6, 12, 24, and 48 Volt systems. Quickly and easily checks voltage, power, ground and circuitry without the need to hook up complex equipment Tall, easy to read LCD display Red LED indicates power (+) and green LED indicates ground(-) Measures from 4.0 to 60.0 volts DC Wire stretches up to 11 feet for use, then automatically retracts Computer safe - draws less than 10 milliamps at 12 volts Heavy duty ground clip with insulator Super sharp stainless steel probe Resolution: 0.1 Volt .