These micrometers come with a calibration certificate traceable to NIST that states they've passed a test for accuracy. All have a friction thimble with a constant-force mechanism, which stops the spindle from tightening once it contacts the surface of the measured object. This ensures repeatable measurements and prevents over-tightening. Once the spindle has stopped tightening, the thimble will continue turning with resistance.

Zero-position memory, also known as absolute (ABS) positioning, retains the measuring position when the micrometer is turned off. A zero-set button allows you to start measuring at any point.