How to Read Scales

Step1	Level telescope. Place scale on surface "A." Focus on scale. Turn micrometer drum to zero. This is now the permanent reference line from which all measurements will be made.
Step 2	To obtain "plus" reading, lower line of sight by means of the optical micrometer until it bisects first precision paired-line graduation which occurs on scale every tenth of an inch. Take the micrometer reading and add it to the scale reading to arrive at the height of "A." The micrometer drum, graduated from 0 to +/- 100, indicates to 0.001 inch how far the line of sight has moved from its original reference point. In the example shown, it moves 0.050 to reach the nearest tenth of an inch on the scale, which is 0.5. The height is therefore 0.050 plus 0.5, or 0.550 inch.
Step 3	Move scale to surface "B." Repeating above procedure renders the height of surface "B" to be 0.345. Subtracting 0.345 from 0.550 gives the difference 0.205 inch between levels "A" and "B."

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How to Read Scales

Step1

Step 2

Step 3