The Fowler 52-570-000 back-plunger style universal dial indicator has a 1-1/2" diameter continuous dial, a 0.200" measuring range, and 0.001" graduations, and is designed to measure surface variations in fractions of an inch. The white face has a contrasting hand to make measurements easy to read. The 0-100 continuous dial has a total measuring range of 0.200" with 0.001" graduations. Brass bearings are economical and accurate. Attachments provide a range of mounting options. The set includes a dial indicator, G clamp, tool post base and vertical rod, extension rod, 3/16" standard anvil, 5/16" anvil, thumb clamp, swing arm attachment, and a fitted storage case. Dial readings with three digits, 0-10-0 for example, signify that the indicator has a balanced dial. Dial readings with two digits, 0-100 for example, indicate the dial has a continuous dial. Balanced dials are used for reading the difference from a specific surface reference point. Continuous dials are used for direct readings and usually have a larger measurement range than balanced dials. Specifications Dial face type and diameter 1-1/2" diameter horizontal face Dial type and reading Continuous 0-100 dial Measuring range 0.200" range Graduations 0.001" graduations Bearings Brass Anvils 3/16" standard and 5/16"Dial indicators are also called dial gauges, probe, and electronic indicators. These precision instruments measure small linear distances and object sizes. The dial magnifies the measurement so that it can be easily read by the human eye. Frequently used in manufacturing, laboratories, and other industrial or mechanical fields, dial indicators are used anywhere a small measurement must be found and recorded or transferred, such as checking the variation in tolerance of a workpiece. Standard dial indicators measure the displacement along the axis of the indicator. Dial test indicators are very similar to dial indicators, except that the axis of measurement is perpendicular to the axis of the indicator. Dial and dial test indicators can be analog, with a mechanical dial, or electronic, with a digital display. Some electronic models transfer the data electronically to a computer for recording and potential manipulation.The Fred V. Fowler Company manufactures inspection and measurement instruments such as electronic indicators, calipers, bore gages, and digital scales. The company, founded in 1946, is headquartered in Newton, MA.What’s in the Box? Dial indicator G clamp Tool post base and vertical rod Extension rod 3/16" standard anvil 5/16" anvil Thumb clamp Swing arm attachment