The Fowler 52-522-101 dial indicator and magnetic base set includes a dial indicator with white American Gage Design (AGD) Group 2, 2-1/4" dial face, continuous dial readings, a 1" measuring range, 0.0001" graduations, a revolution counter, and tolerance markers, and is designed for taking measurements in machining, layout, and inspection work. The indicator has a satin chrome finish that resists corrosion. The dial has microfine black graduations for 0-100 continuous readings, and a revolution counter for longer measurements. A knurled bezel rotates 360 degrees to zero the reading at any location and tolerance markers allow operators to quickly observe limits. The lug back can be mounted on the magnetic base. All exposed metal on the magnetic base has a black anodized finish to resist corrosion. The assembled base has an overall height of 6 inches. The base has a 50lb. magnetic pull and is 1.5 x 1.5 x 1.75" (H x W x D). (H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.)The indicator includes a magnetic base, 4.5" sidearm, swivel clamp, and fitted 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 type AGD Group 2, 2-1/4" diameter Dial reading 0-100 continuous Range 1" Resolution 0.001" Bezel Knurled bezel with clamp rotates 360 degrees Mounting type Lug back Overall stand height (assembled) 6" Magnetic base pull 50lb. Magnetic base dimensions 1.5 x 1.5 x 1.75" H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.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? Fowler white-face dial indicator Magnetic base Sidearm Swivel clamp Fitted case