When you require exact measuring, you reach for a caliper. But an accurate measurement is meaningless if you can't read it accurately. This caliper takes an essential tool into the 21st century with an extra-large LCD digital readout for exact internal and outside measurements accurate to .001-Inch. Instantly converts from SAE or Metric, the display can be zeroed at any point on the slide. Machine-grooved thumb-roll mechanism and position lock for sure adjustment. Hardened stainless steel shaft with depth-measurement probe, precision ground jaws. On-off switch with auto-off, two long-life batteries included (one spare).