Herramienta de sonda de circuito de potencia, comprobador de relé de detección U
If not, the LED remains red and does not beep. The Circuit Tester features a long 20-foot (6m) cable that allows you to test from the front to the rear of the vehicle (trucks, trailers, vessels, tractors and other vehicles that use DC circuits), so easy to check the whole electrical circuit system.