Sealey ta320 digital automotive analyser insulation tester hybrid vehicles sealey ta320 p this analyser insulation tester from sealey is specially designed for hybrid vehicles and conforms to en61010 cat iii 1000v and cat iv 600v unlike other multimeters this unit has an insulation test function that allows testing of the insulation of the high voltage wires found on hybrid vehicles can be used as a stand alone device or linked wirelessly with a usb interface to a pc or laptop enabli