Tudes a dual-range, non-contact voltage tester as well as a receptacle tester. The NCVT-2P is a non-contact voltage tester that detects 12 to 1000V AC and indicates the presence of voltage in cables, cords, circuit breakers, light fixtures, switches, outlets and wires as well as AC voltage in doorbells, thermostats, low voltage lighting and …A non-contact voltage detector is a device that can detect the presence or an electrical charge in a wire, cable, or piece of equipment without having to touch the object. Voltage detectors are primarily used by electricians and electrical technicians. They help confirm that an electrical circuit is turned off, so repairs can be made safely.Reputable brands for non-contact voltage testers are Fluke, Klein Tools, Gardner Bender, Amprobe and Southwire. Going with a device of one of these brands is a safe choice. As usual in the Buyer’s Guides on this site, I have left out the off …Jun 26, 2020 · The non-contact voltage detectors has antenna for picking up the leakage current on active live wires. The leakage current flow through antenna and fed to very high gain amplifier. The amplifier output goes high when it detects weak electrical signals. The amplified voltage can be interfaced with LED or buzzer.