Välismikromeeter

Välismikromeeter, also known as an outside micrometer, is a precision measuring instrument used to determine the external dimension of an object. It is a type of micrometer caliper, which utilizes a spindle and an anvil to measure the distance between two opposing surfaces. The device consists of a calibrated scale, a thimble, and a sleeve. The thimble, which rotates along the sleeve, is marked with fine divisions representing hundredths or thousandths of a millimeter or inch. The sleeve contains the main scale, indicating whole millimeters or inches.

To use a välismikromeeter, the object to be measured is placed between the spindle and the anvil. The thimble is then rotated until the spindle lightly contacts the object. The reading is obtained by combining the measurement indicated on the sleeve with the reading on the thimble. This allows for highly accurate measurements, typically to within 0.01 mm or 0.0001 inches, making it indispensable in manufacturing, engineering, and scientific research where precise dimensional control is critical. Calibration and proper handling are essential to maintain the accuracy of the välismikromeeter.