Measure insulation resistance up to max 4000 m with test voltages 1252505001000 v in addition et 100 offers the measurement functions for dc and ac voltages up to max 600 v cat iii and for resistance in up to 400 with the included bag a comfortable operation of the device is possible because the et 100 must not be maintained in hand during the measurement the soft moulded rubber protection device is ideally protected