Description: [Socket Tester] The multi function digital display socket tester is used to test whether the circuit polarity of the power socket is connected correctly. [Plug and Play] With 7 light indicators patterns to indicate the state of the socket, easy to read: Correct, Open Ground, Open Neutral, Live/Neutral Reverse,Live/Ground Reverse, Live/Ground Reverse Missing Ground. [Wide Application] The phase detector can remind users to check the faults and hidden dangers of sockets in time to ensure the safety of household electricity.Polarity testers are widely used in schools, laboratories, homes and other fields as general measurement tool. [Easy to Carry] Small size, 5.6cmx5.6cm/2.20inchx2.20inch. The socket polarity detector is portable and lightweight, easy to carry and store. [Clear Identification] Ideal for measuring power parameters, working tool with higher precision, designed for detects common wiring problems. Specification: Material: Plastic Size Chart: 5.6cmx5.6cm/2.20inchx2.20inch Package Includes: 1 Piece Socket Tester