6-12v dc high/low tester, use on 12v dc automotive circuits to determine whether the circuit is live, simply clip the insulated alligator clip to the frame of a vehicle & plug the other end into the tester, pierce the steel tester point through the wire insulation of a live 12v dc circuit, if the light bulb in the tester illuminates, the circuit is a live circuit, handle of the tester is tinted so as to see the bulb illuminate in the sunlight, with 3w bulb, tinted handle, 6-12v dc wire piercing.