Measure the diameter of small holes, grooves, and recesses.

A different measuring range on each gauge makes these sets handy for checking a variety of hole sizes. Each gauge has spring-loaded contacts on the probe, which expand inside holes to measure diameter.

Detect variations in a range of hole diameters and depths.

Check a hole’s diameter and detect out-of-roundness problems.

Use these gauges to measure the inside diameter of holes and cylindrical bores, as well as identify out-of-roundness problems.

Check roundness, taper, and diameter near the bottom of bores—the flat bottom on these gauges positions the anvil against the base of the hole.

The jaws on these micrometers work like caliper jaws to precisely measure inner diameters.

With an LCD screen, these micrometers make it easy to read inside diameter measurements taken from cylinders and rings.

Find the inside diameter of cylinders and rings.

Whether a chamfered edge is in a screw hole or on the end of a rotary shaft, these gauges find its diameter. The calculated diameter displays on the LCD screen for quick readings.

Test a variety of tight slots and holes in precision parts, such as electronics. These sets include a gauge with a built-in LCD screen, an array of anvil sizes, and setting rings.

Check the diameter of holes with the pull of a trigger. These Starrett sets have everything you need for one-handed measurements—a pistol-grip gauge, heads for varying diameters, and setting rings.