The Socket & See SOK32 Socket Tester quickly and safely tests standard UK 230V mains sockets for wiring and polarity faults. It works as soon as it is plugged into a socket and can detect 17 different wiring faults. Indication is provided by a buzzer and a set of three traffic light LEDs that light up in different colour sequences to show different faults. A chart detailing the most common faults is available on the front casing of the tester. There is a self check function to ensure ongoing accuracy.