UT12D non-contact AC voltage detectors are widely used in the maintenance of lowvoltage equipments such as conductors, cables, sockets, and other electrical/electronics instruments. It is a very handy tool for electricians. Low voltage mode: Low-voltage motor (<90V), audio systems, arc welding machines, underground mining lighting, cables with thick insulation layer and other weakelectromagnetic AC signals. High voltage mode: Urban electric supply and three-phase systems (90~1000V). For Example, power distribution units, electrical panels, electrical appliances. 1. Auto power off 2. Buzzer 3. LED indication 4. AC voltage detection 5. High/Low voltage moder