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 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. 【Easy to Carry】Small size, 7cmx7cm/2.76inchx2.76inch. The socket polarity detector is portable and lightweight, easy to carry and store. 【Clear Identification】It can test the socket voltage and show on the LED screen, working tool with higher precision, designed for detects common wiring problems. 【Wide Applications】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 tester are widely used in schools, laboratories, homes and other fields as general measurement tool. Specification: Material: PP Work voltage: 2.6~3.3V Test voltage range: 90V~250V/500~60Hz Size Chart: 7cmx7cm/2.76inchx2.76inch Package Includes: 1 Piece Socket Tester