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

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.

Inspect a variety of hole sizes with the gauges in these sets. Each has spring-loaded contacts on the probe, which expand inside holes to measure diameter.

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.

Extend your micrometer's reach for measuring deep holes.

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.

Read measurements easily on an LCD.

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.

The black-oxide treatment on these no-go gauges shows wear patterns so you can tell when you need to calibrate or replace the gauge—they help you check the maximum 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.

Add a handle to hold your plug gauge. No need for bushings—one handle fits a range of plug gauge sizes.

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.

Vital for dimensional quality control, these gauge blocks are often used for precision layout, machine setup, and producing close-tolerance dies and fixtures.

Use these Starrett gauge block sets for precision layout, machine setup, and producing close-tolerance dies and fixtures.

Use these Mitutoyo gauge block sets for precision layout, machine setup, and producing close-tolerance dies and fixtures.