The pocket-sized Voltage Test Pencil The portable non-contact voltage tester from Fluke are easy to use just touch the tip to a terminal strip, outlet, or supply cord. When the tip glows red and the unit beeps, you know there's voltage present. Electricians, maintenance, service, safety personnel, and homeowners can quickly test for energized circuits in the workplace or at home and even detect miswires of an electrical outlet. Key feature 1Be aware of voltage easily - the tip glows red and a beeper sounds when voltage is detected 2Continuous self-test so you always know its working 3Voltage detection range for wide application use - 200 V to 1000 V AC 4Audible/Silent mode for added convenience