Measure the inside diameter of holes and cylindrical bores, as well as identify out-of-roundness problems.

Check for sizing errors in small slots and holes. These bore gauges are often used in precision manufacturing to test electronics and small-scale prototypes.

No need for other tools to set a baseline diameter—these bore gauges have a built-in micrometer head.

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.

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.