top of page

Importance of Depth Micrometers, the Need to Calibrate them, & the Calibration Process

Updated: Oct 28, 2020

Depth micrometers are highly useful measurement devices that allow us to measure the depth of holes, slots, counter bores, recesses, and the distance from a surface to some recessed part — with high accuracy. Available in both metric and imperial systems, depth micrometers read exactly opposite to the method used to read an inside or outside micrometer. The Zero is located towards the closed end of the thimble. The measurement is read in reverse — and increases in depth amount — as the thimble moves towards the base of the instrument. There are also digital depth micrometers, which switch/convert from metric to the imperial system easily.

The Need for Calibrating Depth Micrometers 

Just like any other measuring device, over time, due to various reasons, your depth micrometers start underperforming, i.e. stop offering accuracy in measurement. It’s important that you calibrate your measuring device at regular intervals (depending on how frequently it’s used) to ensure it keeps performing up to the mark and offers high accuracy. If your device is not providing correct measurements, contact Custom Calibration to get depth micrometer calibration services. Wrongly or not calibrated devices can lead to errors and hamper critical measurements. For example, a deflection of only 0.0001 or 0.0002 inches, could mean 50% of some tolerance bands. Therefore, there is a need to calibrate measurement devices like depth micrometers.

Depth Micrometer Calibration Process

Depth micrometer calibration is simply made by inserting the 0-25mm rod and turning the thimble counter-clockwise so the measurement rod tip is recessed completely into the base. The base flush is firmly held on a flat surface while turning the thimble ratchet clockwise —until the measurement rod tip is stopped by the flat surface, and the ratchet “clicks” three times. The thimble lock is tightened and the sleeve zero lines are lined up with the Zero on the thimble scale. If they are not aligned, the tip of the calibration wrench is positioned in the calibration wrench hole on the sleeve and rotated to achieve alignment.

Choose Custom Calibration for Calibration of Measurement Devices

Need help calibrating your depth micrometers? Look no further than Custom Calibration! We offer both in lab and on-site calibration services for testing and measurement devices.

26 views0 comments

Recent Posts

See All


bottom of page