Inside micrometers directly read the internal dimensions of holes, bores and slots. Internal diameters in 1" increments to 0.001" accuracy and 50 millionths (0.00005") resolution.

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Choose from our selection of Starrett inside hole micrometers, caliper-style inside hole micrometers, Starrett telescoping bore gauge sets, and more. Same and Next Day Delivery.

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Mitutoyo caliper-type inside micrometers are designed to measure inside diameters and hard-to-reach areas such as grooves with high accuracy. Available in digital and mechanical models, the jaws are …

Inside micrometers and sets measure the inside diameters and internal dimensions of holes, bores, and other openings.

Measure internal dimensions of holes, bores and slots. Fowler inside micrometers are known for their accuracy, durability, and value.