The Fowler 52-646-250-0 Right Angle Dial Bore Gage has a measurement range of 2-6" and gradient spacing of 0.0005". This direct-measuring gage measures difficult-to-reach bores and has an insulated grip for extra stability. It uses a two-point contact system to detect geometry problems such as ovality and taper, and carbide-tipped contact points provide extended wear and improved abrasion resistance. Fowler, an American company, manufactures premium inspection and measurement instruments like electronic indicators, calipers, bore gages, and micrometers. The company, founded in 1946, is headquartered in Canton, MA.