A Socket Tester, with convenient and compact plug-in style. The tester designed to identify wiring faults at UK 13A 3-pin power sockets. Over 17 combinations of wiring fault can be identified including missing wires and incorrect or reversed connections. Faults are signalled by 3 bright LED’s on the front of the unit, with a simple diagnosis chart for typical errors included on the label next to the LED’s. 2 green LED’s signal a correctly wired socket, and a third red LED identifies a fault. If either green LED fails to light, or the red LED comes on, a fault is present and will require further investigation. It can be used for initial identification of socket faults following socket replacement or re-wire work of any kind. Simple miss-wires or missing connections can be quickly identified prior to full BS7671 electrical test and inspection, so saving time during the testing and certification process.