Martindale cm51 300a ac mini clamp meter martindale cm51 p martindale s cm51 is a high accuracy current only auto ranging mini ac clamp meter that can measure up to 300a with a resolution of 10ma p p despite having a jaw capacity of 27mm the compact meter is small enough to fit into a shirt pocket making it ideal for electricians maintenance teams and installers in both residential and commercial applications p iframe width 560 height 315 src https www youtube nocookie com