Today on Repairs101 I’m going to show you

how to read the three most common types of Vernier Scale calipers.

These are the callipers I’ve 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

doesn’t 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.

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 that’s within reach

of the target area – 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 Vernier’s zero is just over one centimetre, so we go across the Vernier

scale to see where the lines match up exactly. 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 you’re looking for an imperial decimal measurement you look at

the upper scales – ignoring the lower metric scales and you see that a US quarter measures

zero point nine five inches.

Okay. When measuring quarter; the upper zero is on 9 and and two hashes. That translates to .095?

My one says it is 15cm but it has the fine tuner on it but it only extend to approx 13cm. Can I use all 15cm some how?