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How to take comparative measurements using a dial caliper?

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Although dial calipers are usually used to take direct measurements, they are also a useful tool to use when comparing dimensions. Although dial calipers are usually used to take direct measurements, they are also a useful tool to use when comparing dimensions.
For example, you could use a dial caliper to find out the difference in length between dimension A and dimension B. For example, you could use a dial caliper to find out the difference in length between dimension A and dimension B.
 Step 1  To make a comparative measurement, measure the reference dimension (the dimension you want to compare the second measurement with).      In this case, this is dimension A.

Step 1 – Measure reference dimension

To make a comparative measurement, measure the reference dimension (the dimension you want to compare the second measurement with).

In this case, this is dimension A.

 Step 2  Then, set the dial indicator to zero.     To do this,  loosen the bezel nut and rotate the face of the dial until the indicator is pointing to zero.

Step 2 – Zero caliper

Then, set the dial indicator to zero.

To do this,  loosen the bezel nut and rotate the face of the dial until the indicator is pointing to zero.

Step 3  Lock the dial into place, by re-tightening the bezel nut.

Step 3 – Lock dial

Lock the dial into place, by re-tightening the bezel nut.

Step 4  Then measure the dimension to be compared (in this example, this is dimension B).     The value shown by the dial indicator will be the difference between A and B.

Step 4 – Measure dimension to be compared

Then measure the dimension to be compared (in this example, this is dimension B).

The value shown by the dial indicator will be the difference between A and B.