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In self-check before use, please hold the pen tip with one hand and touch the tail with the other hand.When the light is on, it means the tester pen is normal and has sufficient power. No light indicates that the battery needs to be replaced.

One hand touches the bottom of pen, and the tip of pen touches the wire. The breakpoint is where the light goes out. It is used to find breakpoints in daily household appliances such as rice cookers, computers, and plug-in boards, etc.

The pen is designed with a bright LED light, which is also an obvious cue when used during the day. What’s more, it is waterproof, which allows you to work well outdoors.