KELIBRON guides

Learn to measure with calipers

Short, exact guides to reading calipers, measuring real parts, judging tolerances and caring for instruments. Every guide opens a matching exercise in the free 3D lab.

Start with the basics →Open the lab

Lab clipRead a vernier caliper on a Ø25 shaft (readout view)Open in the lab →

Browse by topic

Reading calipers

How vernier, dial and digital calipers are read, with worked examples — the place to start.

Measuring methods

Outside, bore, depth, steps and centre distances on real parts, and the mistakes that spoil a reading.

Tolerances and decisions

Limits and fits, choosing an instrument for the tolerance, and how uncertainty affects pass or fail.

Instrument care

Daily checks, calibration with gauge blocks, registers, labels and records.

Teaching and certification

Using the lab in class and in company training, and what practical assessments check.

Beginner’s path

Try it in the lab

About the lab

Is KELIBRON free?

Yes. It runs in any modern browser with WebGL, without installation or an account.

Which calipers can I practise with?

A digital caliper (0.01 mm, ORIGIN, ZERO/ABS, UNIT, HOLD), a dial caliper (0.01 mm, 1 mm per revolution) and a vernier caliper (0.02 mm, with a 1/128 in inch vernier), each 0–150 mm.

What can I measure?

Outside diameters (also on a stepped shaft, a flange, a gear and a keyed shaft), bores with the inside jaws, and blind-bore depths with the depth rod. Some parts are made out of tolerance on purpose.

Does it work on phones and tablets?

Yes: the layout adapts to phones in portrait and landscape; long-press shows part explanations.

Can I share a setup with students?

Yes. The share button copies a link that reopens the same caliper, part, task and pose; it opens in the viewer’s own language.

Which languages are available?

English and Simplified Chinese.