features:
1. Auto power off
2. Buzzer
3. LED indication
4. AC voltagedetection
5. High/Low voltagemode

Applications:
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). Forexample, power distribution units, electrical panels, electrical appliances.