Second, vernier calipers not only have digital display, but also dial type.
Third, extension:
Vernier caliper is a measuring tool for measuring length, inside and outside diameter and depth. The vernier caliper consists of a main ruler and a sliding vernier attached to the main ruler. Viewed from the back, the cursor is a whole. A spring piece is arranged between the cursor and the ruler body, and the cursor and the ruler body are pressed by the elastic force of the spring piece. There is a fastening screw at the upper part of the cursor, which can fix the cursor at any position on the ruler. The main ruler is usually in millimeters, while the cursor has 10, 20 or 50 scales. Vernier calipers can be divided into 10-degree vernier calipers, 20-degree vernier calipers and 50-degree vernier calipers. There are two pairs of movable measuring claws on the caliper and the main ruler of the vernier, namely, the inner measuring claw and the outer measuring claw. The inner measuring claw is usually used to measure the inner diameter, and the outer measuring claw is usually used to measure the length and outer diameter. The depth ruler is connected with the cursor to measure the depth of the groove and the cylinder.