Martindale mm94 high performance true rms digital multimeter martindale mm94 p martindale s mm94 is a high performance true rms multimeter with a 600v cat iv safety rating it has an extended current measurement range of up to 20a for short duration tests measurement capabilities include ac voltage dc voltage capacitance resistance and temperature with the included k type thermocouple p p features of the mm94 include min max and peak measurement and a high frequency filter to optimise