What is a digital scale unit?

Digital Scale Unit which offers you easy reading, gearless measurements in both English and Metric display without the need to read a Vernier. The Easy Glide action provides the
smoothness and "feel" to make accurate measurements. Reads to 0.0005"(0.01mm).
The digital scale unit eliminates reading errors and makes it possible for even unskilled operators to measure quickly and reliably.