Sealey acdc current clamps sealey ta311 a 40a400a current clamp from sealey designed for use with a standard multimeter and measures current draw from vehicle components in situ no need to break into the circuit suitable for measuring both ac and dc current fitted with 4mm banana connectors and supplied in storage pouch powered by 9v battery supplied can also be used with an oscilloscope using a suitable bnc conversion adaptor sealey ta311 40a400a acdc current clamp 28mm