Detect variations in a range of hole diameters and depths.

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

The dial on these gauges displays size deviations in real time. These gauges measure small slots and bores in precision parts, such as electronics, where even small size deviations can cause inefficiencies.

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

Test for size deviations across a range of hole diameters.

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.

Versatile enough for general checks, these bore gauges have spring-loaded contacts on the end of their probe to expand inside holes.

Spring-loaded contacts on the end of the probe expand inside holes, making these bore gauges versatile enough for general checks.

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

Check a variety of hole, groove, and slot diameters. Each gauge in these sets has a different measuring range.

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.

Reach into bores to measure the precise size and location of grooves.

These calipers come with a calibration certificate traceable to NIST that states they've passed a test for accuracy.

Find a hole’s ID without having to compare it against a set measurement like you do with dial bore gauges.

Measure hole diameter in dirty machine shops and the outdoors with the pull of a trigger. Rated IP67, the bore gauge in these sets is protected from dust and temporary submersion in water.

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.

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.

Make sure the top diameter of a chamfered hole isn’t too big or too small.