Calipers

Calipers are versatile precision measuring instruments used to determine the external dimensions, internal dimensions, depth, and step measurements of a workpiece with high accuracy. Available in vernier, dial, and digital readout styles, calipers are among the most commonly used hand tools in machining, inspection, and quality control environments. Typical measuring ranges span from pocket-sized 100 mm instruments to large 1000 mm floor-standing models, with resolutions as fine as 0.001 mm on high-end digital models.

Calipers are used extensively in metalworking, plastics, electronics assembly, and research laboratories. Key selection criteria include jaw type, material (hardened stainless steel or carbide-tipped jaws), IP rating for coolant resistance, and output interface (RS-232, Digimatic, Bluetooth) for integration with statistical process control (SPC) systems.

Typical Applications

Measuring shaft diameters, bore sizes, and wall thicknesses on machined components
Depth measurement of counterbores, grooves, and stepped features during inspection
First-article inspection and in-process gauging on CNC machining centers
Electronics assembly verification for PCB component heights and connector dimensions
Tool setup and workholding fixture qualification in precision manufacturing

Popular Brands

Mitutoyo offers the Absolute and Coolant Proof caliper series with industry-leading resolution and durability. Starrett provides traditional vernier and dial calipers favored by toolmakers for their craftsmanship. Brown & Sharpe (Tesa) and Mahr serve the precision segment, while Fowler and SPI offer reliable options for everyday workshop gauging.