Martindale cm82 ac amp cm84 acdc 1000a clamp multimeters martindale cm82 the martindale cm82 is a high specification 1000a ac clamp meter packed full of functions for the installation testing and maintenance of domestic and industrial installations the meter is light enough for easy one handed operation but still robust enough for use in harsh environmentsthe cm82 offers ac only current measurement up to 1000a but has the added advantage of capacitance measurement ranges from 4nf to 4