Fowler 52-520-450 X-Proof IP54 Shockproof Indicator, 0-1" Measuring Range, 0.001" Graduation Interval, 0-100 Reading, 2.25" Diameter

The Fowler 52-520-450 X-Proof dial indicator is shockproof and waterproof with an Ingress Protection (IP)-54 rating, has an American Gage Design (AGD) Group 2, 2-1/4" dial face with a continuous dial, a 0-1" measuring range, 0.001" graduations, a revolution counter, and tolerance markers, and is designed to measure surface variations in fractions of an inch. The 0-100 continuous dial with revolution counter has a total measuring range of 0-1" and 0.001" graduations, with each revolution equal to 0.1". An adjustable bezel and dial zeros the reading at any location. Tolerance markers allow operators to observe limits at a glance. The carbide contact point provides durability for surfaces with a hardness rating below that of carbide. The lug back is on a sealed back plate for mounting the indicator at right angles to the stand. Protective O-rings on the safety cap, bezel and rotating dial, and IP-54 rating ensure protection from oil, dust, coolant and water.

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.

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.