The main scale of a vernier caliper is typically graduated in millimeters or inches, with the smallest division on the main scale being 0.1 mm or 0.01 inches. The vernier scale on a vernier caliper allows for more precise measurements, with divisions that are smaller than the main scale. The smallest division on the vernier scale is typically 0.02 mm or 0.001 inches, providing the ability to measure to a higher degree of accuracy.
On the other hand, the smallest division on the main scale of a screw gauge, also known as a micrometer screw gauge, is usually 0.01 mm or 0.001 inches. The screw gauge works by turning a calibrated screw to precisely measure the dimensions of an object. The device is commonly used in mechanical engineering and machining to measure small distances with high precision. The screw gauge provides measurements that are more accurate than a simple ruler or caliper due to its fine adjustment capabilities and small measurement increments.
