... can be conducted without loss of accuracy or damaging the meter.Standards:IEC51, IEC61010-1, VDE410, BS89, UL94, NE60051 ... by the manufacturer, the protection provided by the meter may be impaired.Accuracy class:AC, DC Voltmeters ... 3.0.The power factor meters and synchroscope meter comply with accuracy class 2.5.Insulation test: ... specified mounting angle only. DE-96A DC Square Panel Ammeter meter