Fowler 54-566-200 Bowers Xt Holematic Pistol Grip Bore Gage Set, 4-8" Measuring Range, 4 Heads, 1 Handle, 2 Rings

The Fowler Bowers XT Holematic Pistol Grip Bore Gauge Set has a resolution of 0.00005" and self-centering heads to eliminate operator influences. Pistol grip allows for single-handed operation with repeatable results and the swivel LCD provides quick measurement reading. These direct-measuring gauges use three-point contact to detect lobing and triangular form error, with tungsten carbide contact points on anvils above 0.5". The gauge has RS-232C output and USB connectivity as well as three preset memories. Sets include setting rings.

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.