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Answer:

deviceThe smallest value that can be measured or read on the instrument is the minor count of a measuring instrument. In the case of a main scale in millimeters, the most minor count is determined by the most minor division or graduation on the scale.

We need to know the minor division or graduation on the scale to find the least count of a main scale in millimeters. Let's consider an example where the most minor division is 0.1 millimeters.

The minor counts can be calculated by dividing the value of the smallest division by the total number of divisions on the main scale. In this case, if the main scale has ten divisions between two consecutive millimeters, the least count would be:

0.1 millimeters (most minor division) divided by ten divisions = 0.01 millimeters (most minor count)

Therefore, in this example, the innermost minor count of the main scale in millimeters is 0.01 millimeters.

It is essential to note that the least count may vary depending on the specific main scale being used, as different measuring instruments can have other numbers of divisions and minor ones on their scales.