Fluke 373 true rms ac clamp meter fluke fluke 373 p the new fluke 373 clamp meter offers improved performance perfect for any ac only current measurement situations featuring true rms ac voltage and current measurements and resistance measurement up to 6000 omega with continuity detection the fluke 373 is everything you need plus a little more p p this work horse clamp meter offers improved performance that is perfect for many ac only current measurement situations with true rms ac