Intelligent Socket Tester Handheld Voltage Tester RCD Leakage Detection Tool LCD Display with Voice Broadcast Automatic Shutdown Function for Home Office and Industrial Use Name: Socket Tester  Material: plastics Battery: 2 * AAA batteries (not included) RCD working voltage：220 V, ±20 V Working voltage: 48-250 V, 45Hz Working environment: 0℃-40℃, humidity (20%-70%) Storage environment: 10℃-50℃, humidity (20%-70%) RCD leakage current: >30mA Zerofire voltage measurement ranges: 60-250 V (20-60Hz) Zeroground voltage measurement ranges: 0.1V-10V (50-60Hz) Auto shutdown: 15 minutes without operation Package size: 85 * 75 * 60mm / 3.35 * 2.95 * 2.36in Package weight: 140g / 4.94ounce