Fowler 52-520-125-0 whiteface 0.250” Premium dial indicator with improved mechanism has an American Gage Design (AGD) Group 2, 2-1/4" dial face with a continuous dial, a 0-0.250" measuring range, 0.0005" graduations, a revolution counter, and tolerance markers, and is designed to measure surface variations in fractions of an inch. It has 0-25-0 balanced reading. The 0-50 continuous dial with revolution counter has a total measuring range of 0-0.250" with 0.0005” increments. An adjustable bezel and dial sets the zero reading at any location. Solid steel housing, Tolerance markers allow operators to observe limits at a glance. The carbide ball contact point provides durability and long life. It includes NIST certificate of calibration. 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, probes, 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.