Features: Display: 3.5 digital LCD with a MAX reading of 1999， Auto polarity displayMeasure method: double integral A/D switch implementSampling speed: 2 times per secondOver-load indication: "1" is displayedoperating Environment: 0~40，at<80%RHStorage Environment: -10~50，at<85%RHPower: 2 size AAA batteries (Not include)Low battery indication: supportStatic electricity: about 4mAClamp dimension: 25mm for open jaw; 35mm for inner diameter Technical specifications: AC Current:Range AC2A Resolution 1mA Accuracy ±(2.5%+10d)Range AC20A Resolution 10mA Accuracy ±(2.5%+10d)Range AC200A Resolution 100MA Accuracy ±(2.5%+10d)Range AC600A Resolution 1A Accuracy ±(2.5%+10d)Note: test lead under measure should be put uprightly in the center of clamp sensor， or accuracy will be affected. DC&AC Voltage:Range DC20V Resolution 10mV Accuracy ±(0.8%+3d)Range DC600v Resolution 1V Accuracy ±(1.0%+3d)Range AC600v Resolution 1V Accuracy ±(1.2%+5d)Input Impedance: ≥10MΩ ResistanceRange 2KΩ Resolution 1Ω Accuracy ±(1.0%+4d)Range 200KΩ Resolution 100Ω Accuracy ±(1.0%+4d)Range 2MΩ Resolution 1KΩ Accuracy ±(1.0%+4d)Overload Protection: 250V DC/AC virtual value Phase Indication (50Hz)Range: AC380V±10%， Phase indication: OK/Reversal/MISS， Accuracy ±3% Live Wire TestRange: 180V~400V， Live wire detect: LIGHT or LCD indication