With an LCD screen, these micrometers make it easy to read inside diameter measurements taken from cylinders and rings.

Find the inside diameter of cylinders and rings.

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

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.

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.

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

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

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.