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.

Set and check the accuracy of two-point bore gauges.

Check the top diameter of chamfered holes to make sure they’re within tolerance.

Use these Class Z go gauges to check the minimum hole diameter. Also known as pin gauges, they help you measure hole size and depth, check hole location and distance, and set micrometers.

These Class Z no-go gauges help you check the maximum hole diameter. Commonly known as pin gauges, use them to measure hole size and depth, check hole location and distance, and set micrometers.

A black-oxide treatment on these go gauges shows wear patterns so you can tell when you need to calibrate or replace the gauge—use them to check to minimum hole diameter.

Take precision go/no-go measurements of hole sizes and depths, check hole location and distance, and set micrometers.

Get your choice of one target-size gauge with 12 larger gauges and 12 smaller gauges, graduated in 0.0001”. Use these sets to measure hole sizes and depths, check hole locations and distance, and set micrometers.

Check the true diameter of holes, even if they’re bent or curved. The thin stem on these gauges flexes to reach features deep inside holes and cavities.

A certificate of calibration traceable to NIST states that these sets have passed a test for accuracy.

Width markings on the leaves let you check diameters and widths.

Check a range of thicknesses with a single tapered gauge.

Replace an entire feeler gauge set with one of these tapered gauges that lets you check a range of thicknesses.

A notch on the handle indicates when the internal NPT threads you’re checking are in tolerance.

Ensure the accuracy of NPT thread measurements—these gauges come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy.

Use the Mitutoyo gauge blocks in these sets individually or together to take precise measurements or calibrate your measuring tools. All come with a certificate traceable to NIST to certify they were calibrated in a lab and meet tight tolerances.

Use the gauge blocks in these sets individually or together to take precise measurements or calibrate your measuring tools.

A true source of measurement, use these gauge blocks to calibrate measuring equipment, mark precise layouts, or position your fixture or machine components just right.