... Data Storage: 500 sets. .Technical Specification FunctionSimultaneous measurement of three-phase AC voltage, current, phase between voltage, ... protection systems, read the phase relationship between CTs of the differential protection, check the meter wiring right ... pecificationsIEC61010-1 CAT Ⅲ600V, IEC61010-031, IEC61326, 2 class of pollutionAccessoriesMain Unit: 1pc; Meter Box: 1piece; Current Clamp: ...