A convenient, compact plug-in style tester designed to identify wiring faults at UK 13A 3-pin power sockets. Capable of identifying over 17 combinations of wiring faults including missing wires and incorrect or reversed connections. Simple and easy to use. Faults are signalled by 3 x LEDs with a simple diagnosis chart for typical errors. 2 x green LEDs signal a correctly wired socket, and a 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. CAT III 300V LED Indicator Mains Polarity Test Identifies 17 Combinations of Wiring Faults Instant Error Reporting & Fault Diagnosis Easy to Use Rugged Design CAT III 300V LED Indicator Mains Polarity Test Identifies 17 Combinations of Wiring Faults Instant Error Reporting & Fault Diagnosis Easy to Use Rugged Design