The Fowler 52-520-485-0 dial indicator has an American Gage Design (AGD) Group 2, 2.25" dial face with a continuous dial, a 0-1" measuring range, 0.001" graduations, a revolution counter, and tolerance markers. It 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" with each revolution equal to 0.1". An adjustable bezel and dial set the zero reading at any location. Tolerance markers allow operators to observe limits at a glance. The carbide ball contact point provides durability and long life. The magnetic back can mount the indicator on most metal surfaces, and a protective coating provides durability and long life. This product has a 1-year warranty offered by Fowler High Precision. If you experience any problem, contact Fowler directly for warranty claims. Fowler, an American company, manufactures premium inspection and measuring instruments like electronic indicators, calipers, bore gages, and micrometers. The company, founded in 1946, is headquartered in Canton, MA.