Voltage detectors can detect if a circuit has a voltage. This is important to avoid accidents when working on electrical components. Berg offers the FLUKE-353 AC/DC TRMS CLAMP METER 2000A Amps Only which is a pocket-sized voltage detector that glows and beeps when it is touching a terminal with a voltage. If you have any questions, please give us a call at 1-847-577-3980 or send an email to firstname.lastname@example.org. Our knowledgeable staff is there to help and assist you.