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Home > Education >Vernier Caliper Information

The Vernier Calipers

Caliper is a tool that can be used to measure outside dimensions, inside dimensions, or depths of holes.
The Vernier Caliper can not only measure the outside diameter of an object (outside vernier), but also the inside diameter of a hole (inside caliper), or the depth of a hole (depth probe). Usually, we measure the outside diameters frequently. One jaw of the caliper is fixed, and the other jaw moves and is connected to the vernier.
1. We must check that the vernier caliper correctly reads zero when the jaws are closed. (if not, check with the lab instructor.)
2. We need to close the jaws around the object but do not over tighten. The jaws should exert a firm pressure on the object.
3. When both locking screws are tightened the caliper can be removed from the object and read without worrying if the jaws will shift position.
a. You can read the main scale to the nearest tenth of a centimeter.
b. The vernier consists of 50 divisions, meaning that 0.1 cm is divided into 50 parts and the final least count is 0.1 cm/50 = 0.002 cm = 1/50 mm. Read the vernier as described in the previous section, with a result like 1.4 or 1.6 or 2.0. A reading of 1.6 from the vernier really means 0.016 cm which is added to the main scale reading to give the final diameter of 3.216 cm.