It works well and appears to be quite accurate, though I've only done a mild amount of cross-referencing with other tools.  Keeping it from being 5* is only one issue I'm having with it, and that's when it is closed all the way to a 0.00 reading, it's a real mf'er to get it to start sliding open again.  I'm not sure why it sticks like that.  I've lubed it up, worked it, etc., but it still does this.  A strange trait, and maybe it's just mine, but nonetheless that doesn't take it down any further than 4* because this type of product at this price is really a good buy and I would buy it again.