Description: The multi function digital display socket tester is used to test whether the circuit polarity of the power socket is connected correctly. The phase detector can remind users to check the faults and hidden dangers of sockets in time to ensure the safety of household electricity. Wide range of applications: Polarity testers are widely used in schools, laboratories, homes and other fields as a general measurement tool. Easy to carry: The electrical fault checker is made of plastic, small in size and light in weight, making it easy to carry and store. Ideal for measuring power parameters, working tools with higher precision. Specification: Color: black Material: Plastic Size(LxWxH): Approx. 65x62x58mm/2.56x2.44x2.28inch Package Includes: 1 Piece Socket Tester Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on line shopping!