Repeated Measurements of Vernier Calipers

In order to ensure the accuracy for measurements, you should frequently use repeated measurements. Though they are an effective way for checking instruments, simple repetition of the same reading is a partial of precision and not a test of accuracy at all. The repeated measurements will only check the accuracy on the measurement when the ture value of the test part is already known.
Under the certain conditions, you can repeat incorrect measurements very reliably. Thus you should use gage blocks or master cylinders to take repeatability tests with standards of the already known value.

Repeatability, Accuracy and Precision

First of all, the repeatability of one measurement on one part with the same instrument and observer does not measure the accuracy of the instrument, the precision of the instrument, however, it does measure the combined precision of the observer and instrument for one portion of the entire range. What is more important is that, it can measure the accuracy for the combined observer and instrument for one portion of the entire range if the ture value for the test part is known.

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