Name: Direct, indirect and comparative measurement
Uploaded: 2026-11-03T08:00:00+08:00
Duration: 46 s
Description: Direct, indirect and comparative measurement: a 46-second captioned video from the KELIBRON 3D measuring lab, with every step written out and a link to try it in the lab.

Direct, indirect and comparative measurement

Direct, indirect and comparative measurement: a 46-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 Direct, indirect and comparative measurement
0:05 Direct measurement: the reading is the size you want.
0:11 Now the large diameter.
0:17 Shoulder height = (large − small)/2. That is indirect measurement: the result is calculated from two readings, and each diameter’s error counts only half.
0:24 Comparative measurement: take this bushing as the standard (its size is shown below), close on it and press ZERO. The display shows INC.
0:30 Change to another part: the display shows only the difference from the standard.
0:36 Size = standard + difference. Switch back to absolute to check it.

In the course

Measurement basics · Measuring methods — Recognise the main kinds of measurement and when each is used.

Read the guide

Measurement basicsMeasuring methodsA direct measurement reads the wanted size straight off the instrument; an indirect one calculates it from other measured sizes; a comparative one measures only the difference from a standard of known size.