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Power Supply:DC 7.4V 2600mAh rechargeable lithium batteryWeight:4520g(with package)Data Storage:400 setsData Hold:YesData Read:YesCircuit Voltage:Measuring ground voltage : AC 600V MAXProtection Level:IP65(close the case status)Alarm Function:YesMeasuring time:Earth voltage : 3 times/second Earth resistance: 15 seconds/timeTest Wires:5pcsDisplay Type:Digital OnlyPlace of Origin:CNGUABrand Name:ETCRMeasuring Range:Grounding resistance:0.01u03a9-2000u03a9Testing Voltage:0-600V ACAccuracy Class:xb1 2% rdg xb1 3dgtOperating temprature:-10 u2103 ~ 40 u2103Dimensions:280mm(L)x260mm(W)x160mm(H)