1. Look at the total scale of the cursor to determine the accuracy (10 scale, 20 scale and 50 scale).
2. Read the whole millimeter number (x) of the main ruler on the left side of the zero scale line of the travel scale;
3. Find the position where the travel scale is "right opposite" to the scale line of the main scale, and read the number of small squares (n) from the alignment line to the zero scale line on the travel scale (do not estimate);
4. Read the measured value according to the reading formula.
Reading formula:
Measured value (L)= main ruler reading (X)+ vernier reading (n× precision)
Extended data
The smallest scale on the scale is 1mm, and there are 10 equal scales on the cursor, and the total length is 9mm on the main scale, so each scale on the cursor is 0.9mm, and the difference between a scale on the main scale and a scale on the cursor is 0.1mm..
The minimum division of the main ruler is 1 mm, and there are 50 small divisions on the cursor, and their total length is equal to 49 mm, so each division of the cursor differs from the minimum division of the main ruler by 0.02 mm