A plug in socket tester with BS1363 approval, a Quick Mains Tester providing temporary connection for mains input lead & a Professional Ring Mains Socket Tester – suitable for electrical engineers and home owners. 200-250V AC 50 Hz <0.5 Watts at 220V (Three Indicator Lamps on) : BS EN 61010-1:1993 Overvoltage Category II, Pollution Degree 1 Double insulated Operation Temperature: 5'C to 40°C Relative Humidity0% to 90% (5°C to 40°C) 2000 meters Double insulated Overvoltage protection CAT II Polycarbonate housing Wt: 40gm