This is the perfect addition to your kit with our Electrical tester pen. Our tester pen is composed of high-quality and durable drop-proof insulation, ABS, and 45 steel, which ensures safety while using. 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. 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. It is used to find breakpoints in daily household appliances such as rice cookers, computers, plug-in boards, etc. Buy it now!