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Low voltage voltage tester：It is used to inspect low-voltage electrical equipment with a ground voltage of 250V or below, and is also a commonly used electrical safety tool in households.　

Pre use inspection：1. The insulation rod of the voltage tester should have a good appearance without bending or deformation, a smooth surface, no cracks, no peeling layers, and all components should be firmly connected. 　

The working principle of the pen type measuring pen: The testing pen has a neon tube filled with neon gas, and two metal electrodes at both ends. When current flows from one electrode through neon gas to the other electrode, the neon gas will emit red light. 　

The working principle of a voltage tester is that when testing a charged body, the tester touches the metal hook or metal piece at the back of the voltage tester with their hand. 　

(1) Button Description:(A key) Direct, directly measure the button (far away from the LCD screen), that is, when using the pen tip to directly contact the circuit, please press this button.