Name: One pin, four readings, one you can trust
Uploaded: 2026-11-03T08:00:00+08:00
Duration: 63 s
Description: One pin, four readings, one you can trust: a 63-second captioned video from the KELIBRON 3D measuring lab, with every step written out and a link to try it in the lab.

One pin, four readings, one you can trust

One pin, four readings, one you can trust: a 63-second reenactment recorded in the KELIBRON 3D lab, with English captions. The steps below are the captions in order, and you can do the same measurement yourself in the lab.

What happens in the video

0:00 One pin, four readings, one you can trust
0:05 Half-millimetre line showing? Add 0.5 mm before the thimble.
0:12 Dirt between the faces: the reading runs high and is invalid.
0:21 Off square: the micrometer spans a diagonal, the reading runs high and is invalid.
0:30 Forcing the thimble bends the frame: the reading runs low and is invalid.
0:39 Clean, square, closed with the ratchet: this reading can be trusted.
0:48 A valid reading beyond the upper limit: rejected.

In the course

Micrometers · Common micrometer mistakes — Recognise the mistakes that spoil a micrometer reading.

Read the guide

Measuring methodsCommon micrometer mistakesMost wrong micrometer readings come from the user, not the instrument: a missed half-millimetre line (0.5 mm), parallax, an unchecked zero, dirt between the faces, a tilted micrometer, too much force and heat.