I ordered this caliper to have an inexpensive one for my range bag and to be able to measure something in millimeters. It holds zero. I checked it against my "older" Browne & Sharpe caliper and they read the same. Comes with an extra battery which is a nice plus. Certainly not as smooth as my "older" B&S caliper, but in this price range I didn't expect that. I am hopeful that this caliper will hold up reasonably well it seems to be "not too shabby" and I am pleased with it so far. November 16,2014 update. I have to downgrade this caliper to two stars, Initially I was pleased but recently they started sticking when trying to open them from the zero position. I tried "cleaning" the slide and applying a small bit of lube, this helped but the more I thought about it the less I trusted these things. I am replacing them with something better.