Residual Operated Protective Device and Ground Fault Interrupter Switch help you know whether the power leak protection works well or not, RCD wiring tester test helps you protect your safety against the risk of electric shock Completely suitable for real-time power health of home socket or factory socket. The socket tester with screen display is widely compatible in school, home, laboratory, factory, office and other social grounds Compact size, light weight and convenient to use. Socket tester with voltage backlight LCD display for testing voltage Intelligent detection of digital display socket detector to ensure household electricity safety With 3 indicators and LCD display, the electrical tester is easy for a newer to use Widely used for electrical maintenance testing, desktop socket testing, power strip testing and wall socket testing in school, laboratory, factory and other social fields. Home accession safety acceptance and inspection, socket tester saves you a lot of time testing issues with sockets. Features Socket Tester -The black color. -Material: ABS -Size: 6*6.7*4.5cm Measuring voltage: 90-120V 60Hz, 220-250V 50-60Hz (optional) Voltage measurement accuracy: Plusmn; (2% + 5) Working current: frac14; 3MA RCD: yes The detection function displays both voltage and frequency: correct, missing ground, missing perverse, reverse neutral live, reverse on live ground, reverse live and missing ground Working temperature: 0~40 Working Humidity: 20%~80% RH Storage temperature: -10~50 Altitude: frac14; 2000m RCD Current: FRAC14; Z30MA RCD operating voltage: 220V + 20V Package including 1 * Tester