Test light

（重定向自Test lamp）

A voltage tester with three lamps to give an approximate indication of voltage magnitude

Neon screwdriver test light in use. Current flows through the lamp and the distributed capacitance and resistance of the user's body.

Non-contact voltage tester detects the changing electric field around live wires

North American grounded receptacle tester

A test light, test lamp, voltage tester, or mains tester is a simple piece of electronic test equipment used to determine the presence or absence of an electric voltage (usually alternating current (AC) ) in a piece of equipment under test.

单词	Test lamp
释义	Test lamp 英语百科 Test light （重定向自Test lamp） A test light, test lamp, voltage tester, or mains tester is a simple piece of electronic test equipment used to determine the presence or absence of an electric voltage (usually alternating current (AC) ) in a piece of equipment under test.
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