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.

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

Position these gauges snugly within your bore to measure its diameter. Spring tension pushes the gauge’s two telescoping steel contacts against the walls of your bore.

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

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.

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.

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

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

Measure bore diameter directly. These gauges give you the actual diameter, unlike a dial bore gauge, which only shows the variation from a set measurement.

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.

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

Keep over two dozen different ball diameters on hand to check bore sizes or use as go/no-go 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.

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

For a flush fit every time, these gauges ensure your fastener and countersink mate perfectly for a secure hold.

View measurements on the LCD display of these Mitutoyo gauges to quickly confirm height before you mark and cut material.

Thread your fastener into holes or onto plugs for quick and accurate size identification.

Determine threads per inch and thread pitch on nuts, bolts, and other fasteners.

Identify threads per inch on external threads and find the center of your workpiece to line up thread cutting tools.

Identify Acme threads and use as a guide while grinding and cutting Acme threads to a 29° included angle.

In addition to checking NPT and BSPT pipe sizes, use the two included gauges for measuring thread pitch.

Find tube, pipe, fastener, wire, and drill bit sizes with one tool.