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I've been an electrician for 34 years. "Touchless testers" have been around for some time and I've found them essential in troubleshooting and for personal safety. I've bought about every touchless tester ever made and this is the best. There have been inferior versions by Greenlee and others costing up to $70.00.

This one is supersensitive (make sure you adjust the sensitivity downward on a known "hot-wire before using and then turn up a tad, otherwise you'll get false positive indications). This instrument is audible and visual as well. Highly reccommended and inexpensive. The only reason for four stars is that the unit is not "ultra-grade" in build quality, but that's OK given the price.