I think it is entirely possible that my repeatability issues may be due in part to cheap Chinese edge finders. I lube them then wipe the outside dry before each use, or they don't work at all. If I'm going to drop $50, I might just be better off to buy name brand mechanical ones. One thing I noticed when perusing the electronic ones on ebay is:Only the usa made one from Texas has a tip that measures in thousandths, not mm. I don't want to switch back and forth! So no cheaper option for me than $50 shipped. I have kids, so dropping a fifty requires much thought, maybe a little saving too. I'm hoping more folks have these and are willing to chime in. If I wind up getting one, I'll be happy to add my two cents.