Question

1. using the picture of the micrometer, give the measurement in millimetres to three decimal places. note: refer to example four.

Explanation:

Step1: Read main - scale value

The main - scale reading is 15 mm.

Step2: Read thimble - scale value

The thimble - scale reading is 37.5 (since each division on the thimble is 0.01 mm).

Step3: Calculate total measurement

The total measurement is the sum of the main - scale and thimble - scale values. So, $15+37.5\times0.01 = 15 + 0.375=15.375$ mm.

Answer:

15.375