This 6" digital caliper is a simple and functional measuring device. The plastic LCD display provides easy to read measurements, accurate up to .001", for both internal, external, depth, and steps. The simple press of a button will toggle your display between SAE (inches) or Metric (mm) measurements, and the display can be zeroed out from any postition on the slide. A comfortable locking thumbscrew, makes it easy to lock the jaws of the caliper in place. Its hard, protective carrying case ensures that nothing happens to you caliper in storage or in transit.