1)Single phase electrical socket meter 2)ANSI standard 3)Anti-Tampering function ... the IEC62053-21,IEC62052-11 standing operating procedure 1.0 level of electrical energy measurement request, uses ... (60),20(80)A voltage110V,120V,220V,230V,240V meter form 1S,2SNominal Voltage (Un) 120, 120/240 ... 120/208 V Voltage Range 0.87Un to 1.2UnImpulse Voltage6 kV, 1.2 / 50 μs Single Phase Electronic Socket Meter