Vernier scale calipers by Repairs101

Today on Repairs101 Iím going to show you how to read the three most common types of Vernier Scale calipers.

These are the callipers Iíve collected to represent the three Vernier scales.

Now a digital calliper is easier, more accurate and way more fun to use but a Vernier scale doesnít need batteries.




A Vernier scale is a movable scale running parallel to a fixed scale. They measure very accurately in metric, imperial decimal and imperial fractions.

Calipers measure three different ways: outside measurements, inside measurements and depth measurements.

Inside measurement with vernier scale caliper   Outside measurements of rocker buttons with vernier scale caliper

Now if you have a lot of nearly identical things to measure you might find that this fine adjustment screw makes the job easier by anchoring at a point thatís within reach of the target area Ė then all you need is the fine adjustments to find each individual measurement.

To read this in metric we look at the lower fixed scale. The Vernierís zero is just over one centimetre, so we go across the Vernier scale to see where the lines match up exactly.

Fractional Vernier inside measurement of oil pump

This is an oil pump gear and to find the size of the shaft that drives it you just take an inside measurement.

On this calliper, if youíre looking for an imperial decimal measurement you look at the upper scales Ė ignoring the lower metric scales and you see that a US quarter measures zero point nine five inches.

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