A non-contact tester is an electronic device that works without touching to detect electric current. This device is usually pen-shaped, and when its tip is brought close to an electrical wire or component, it warns with light or sound if it is active. It is mainly used by electricians, technicians, and ordinary users to safely test electrical lines. Using a non-contact tester makes it easy to identify short circuits, grounding problems, or live wires.
This device is battery-powered and very light, and portable. It can be used without touching the electrical wire directly, thus reducing the risk of accidents. Non-contact testers can work in different voltage ranges, and many models also have the facility to adjust the sensitivity. It is a very effective and reliable tool for everyday electrical safety and quick fault detection.