The process of setting zero ensures the measurements you’re about to make are accurate.

Gently close the jaws.

Press the zero button to set the current measurement to zero.

Digital calipers can be zeroed at any point along the scale, not just when the jaws are closed. This can be useful to check the size difference between two components. Take the first measurement, press the zero button, and then take the second measurement. The result is the difference between the two measurements.