4 个月
The Family Handyman on MSNHow to Use Cheap Electrical Testers and Voltage DetectorsEvery electrical current generates a magnetic field, so a non-contact voltage tester can detect current in a conductor ...
来自MSN1 个月
Page settingsThey're inexpensive and easy to use, and they help keep you safe when doing DIY electrical work. First, test the tester by holding it to a known live circuit, like a powered appliance or lamp cord.
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