Martindale cm82 ac amp cm84 acdc 1000a clamp multimeters martindale cm84 the martindale cm84 is a high specification 1000a acdc 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 cm84 offers both ac and dc current measurement up to 1000athe compact clamp multimeter also provides accurate measurement of