I make it a point to have one of these at all times. I investigated my microwave with one of these and found out it was grounded and passing current through the stand it was on...fixed that problem. It's great at finding the exact place where a wire is broken. It's nice to know if there is ANY current running through something before you grab it, and a fluke does that. Sure, there are cheaper brands, but I trust THIS one, because I know it works.