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The Fowler Dial Bore Gauge Set has gradient spacing of 0.0005and the insulated grip offers extra stability while taking measurements. The gauge utilizes a two-point contact system to detect geometry problems such as ovality and taper and carbide-tipped contact points offer extended wear and improved abrasion resistance.Bore gauges measure holes or bores in a workpiece. They can measure the interior diameter of a hole at any depth while internal micrometers 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 caliper 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 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.