Vernier calipers are measuring tools used mainly for measuring linear dimensions. These calipers come handy in measuring the diameter of circular objects. Their circular jaws fit securely on either side of the circumference of round objects. have two types of scales- a fixed main scale and a moving Vernier scale. The main scale is normally in millimetres or 1/10th of an inch. Vernier calipers score well over standard rulers because they can measure precise readings up to 0.001 inches. Vernier scales is used along with the Vernier calliper for accurate measurements.
The maximum capacity of a Vernier caliper is the difference between the smallest and largest measurement reading. Usually, it is the total length of the main scale. Vernier calipers, generally, have a range of 300 mm. Vernier calipers of smaller ranges are also widely available in the marketplace.