Where has this been all my life? Using a normal caliper is fine, I suppose, but reading "somewhere between" two lines can be trying at the best of times. This caliper removes any doubt. It gives you two significant digits past the decimal even when dealing with millimeters. It has a quick-reset calibration button and a button to switch from metric (why would you want to???) to the system used by only two countries: The US and Burma. But hey, if that's how you roll, they provided you that crutch. It's easy to use, and accurate. And did NOT cost much. I am very happy with this.