Starrett 3089Z-131-1424J Dial Bore Gage, 1.4"-2.4" Range, 0.0005" Graduations, Approximate Measuring Depth: 6"

The Starrett 3089Z-131-1424J Dial Bore Gauge has a measurement range of 1.4 to 2.4" and uses a two-point contact system to detect geometry problems such as ovality and taper. It has an ergonomic design with non-slip insulating grip and carbide-tipped contact points for extended wear and improved abrasion resistance. The dial indicator provides inch/metric reading capability. All anvils are laser marked for easy selection and a gauge chart is also included. The gauge measures to approximately 6" and comes in a sturdy aluminium case with cut-outs for the gauge and all accessories. Bore gauges measure holes, or bores, in a work piece. They can measure the interior diameter of a hole at any depth, while internal micrometres can only measure to the depth of their teeth. Bore gauges are typically calibrated with a setting ring and come in two types: simple and direct-measuring. Simple bore gauges are used with a calliper to transfer the hole measurement, while the more complex gauges take the measurement directly, and display it through a Vernier, dial, or digital display. Bore gauges have a two- or three-point contact, indicating how many points on the gauge head touch the inside of the bore. Two-point contacts are better at measuring ovality, while three-point contacts are used to measure lobing or triangular form error. Pistol-grip bore gauges are used for fast, single-handed operation with repeatable results from one operator to another. Bore gauges can also be used in special applications, such as measuring threads, spline pitch diameters, and deep bores. The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company, founded in 1880, is headquartered in Athol, MA.