Vernier caliper: outside diameter of turned shaft Ø25

What happens in the video

1. 0:00 Vernier caliper: outside diameter of turned shaft Ø25
2. 0:04 Close the jaws: the vernier 0 must line up with the main-scale 0.
3. 0:09 Open the jaws and set turned shaft Ø25 deep between them, square to its axis.
4. 0:13 Close the moving jaw gently until both faces touch.
5. 0:18 Read while the caliper is still on the part: 24.98 mm, within 24.95–25.00 mm.

Read the guide

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  Measurement basicsHistory of the caliper: from bronze to digitalChina had a bronze sliding caliper in AD 9, sixteen centuries before the vernier principle appeared; the shape of the caliper in your toolbox was settled between 1900 and 1930.
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  Reading instrumentsVernier caliper exercises with worked answersReading a vernier means one formula — main scale + coinciding line × least count, minus the signed zero error — and every answer below is worked with it: fifteen exercises at 0.1, 0.05 and 0.02 mm and at 0.001 in, plus pass/fail against drawing limits and which instrument a tolerance demands.
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  Teaching and certificationTeaching and training with KELIBRONKELIBRON gives every learner their own digital, dial and vernier calipers, outside, inside and three-jaw micrometers, and a bench of real-sized parts.