(Circuit Detector) This socket tester detects the most common wiring faults in standard and RCD electrical sockets. Able to detect Correct Wiring, Ground Not Connected; Phase not connected; Neutral not connected; Phase/Neutral Inversion; Phase/Earth Inversion; Phase/Earth Reversal, and Unconnected Earth. (RCD Function)This electrical tester tests RCD devices by simulating the unconnected earth condition, which operates on the RCD sockets and confirms the operation of the device protection against unconnected earth. It tests standard sockets which are wired in parallel to the RCD sockets. Be sure to use this function on normal sockets. This may cause the house wiring to trip. (Voltage Display) This RCD tester with LED display helps you measure the socket voltage and display it clearly on the LCD screen, It is also designed with a compact, impact-resistant ergonomic ABS housing, which maintains an impact and crush resistance rating above industry standards. (Instant wiring identification) LED indicators Reds can illuminate clearly for easy visual indication, when activated, identify one of seven common wiring options. An easy-to-understand table on the tester helps determine the condition of the wiring in the outlet, based on the results of the LED indicators. (Safety and Service Certificate)This outlet tester with RCD complies to CAT III 300V and CE marking. KAIWEETS offers 36 months service and technical support. Please do not hesitate to contact us if you have any problems.