Continuous audible tone gives positive good wiring indication Strong warbling tone gives clear warning of faulty wiring Advanced electronics include a quad comparator to give clear indication even on noisy circuits Detects good plus 13 wiring fault conditions Modern production methods ensure great performance and value. Tough, smooth-contoured construction. Eye-catching body colour – easy to find in a toolkit. Advanced electronic circuits mean positive & reliable indication. The testers are designed to give a quick & easy indication of correct wiring at the socket. Particular emphasis is placed on detecting very dangerous wiring conditions such as reversed live earth connections & disconnected wires. Features: Continuous audible tone gives positive good wiring indication Strong warbling tone gives clear warning of faulty wiring Advanced electronics include a quad comparator to give clear indication even on noisy circuits Detects good plus 13 wiring fault conditions What’s included: Socket & See SOK22