The document discusses how to use a Vernier caliper to accurately measure diameter, thickness, depth, and other linear measurements. It explains that a Vernier caliper has inside jaws, outside jaws, a Vernier scale, main scale, and depth gauge. It provides instructions for measuring internal diameter, external diameter, and depth using different parts of the caliper. It also describes how to obtain an accurate reading by matching lines on the Vernier and main scales.

1. Use of Vernier Caliper Vernier Caliper can be used to measure diameter, thickness very accurately.

2. Different Parts of Vernier Caliper Inside jaws Outside jaws VernierScale Main Scale Depth Gauge

3. Measuring Internal Diameter Use the inside jaws of the caliper as shown

4. Measuring External Diameter Use the outside jaws of the caliper as shown

5. Measuring Depth of a Hole Use the depth gauge of the caliper as shown

6. Reading the Vernier Scale Read the “0” position of the vernier scale on the main scale to get a rough reading. Rough reading = 18mm Look along the vernier scale until one of the vernier division coincides with the main scale Accurate reading = 18.46mm±0.01 mm

7. Exercise What is the reading in the caliper shown? Please click on one of the following answer. A. 3.51cm B. 3.57cm C. 3.62cm D. 3.642cm E. 3.67cm 3.5 0 5 10 3 4 overlap

8. Solution Read the “0” position of the vernier scale on the main scale to get a rough reading. Rough reading = 3.6cm Look along the vernier scale until one of the vernier division coincides with the main scale Accurate reading = 3.67cm±0.005cm 0 5 10 3 4 overlap