The Starrett inside dial caliper gauge measures to a depth of 3". It has carbide ball contacts for longer life and wear resistance. The deep opening reaches into the workpiece, such as in bores of castings and inside readings in fabrications, to measure small sections of that workpiece. The retraction lever allows for one-handed use and gauge control, while a direct reading dial hand is for accuracy.
Dial indicators, also called dial gauges and probe indicators, are precision measuring tools used to measure small linear distances and object sizes. The dial magnifies the measurement for readability by the human eye. They are frequently used in manufacturing, laboratories, and other industrial or mechanical fields, and are suitable anywhere a small measurement must be taken and recorded or transferred, such as checking the variation in tolerance of a workpiece. Dial test indicators are very similar to dial indicators, except that the axis of measurement is perpendicular to the axis of the indicator. Standard dial indicators measure the displacement along the axis of the indicator. Dial indicators can be analog, with a mechanical dial, or electronic, with a digital display.
The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company was founded in 1880 and is headquartered in Athol, MA.