Sets include a dial caliper, a micrometer, a ruler, and a case. The micrometer has a friction thimble with a constant-force mechanism, so that once the spindle contacts the surface of the measured object, it will stop tightening. This ensures repeatable measurements and prevents over-tightening. Once the spindle stops tightening, the thimble will continue turning with resistance.

Sets with a depth micrometer measure the depth of holes, slots, shoulders, and projections. Change out the steel extension rods for your application—they come in 1" incremental lengths. They have a ratchet thimble with a constant-force mechanism that works similar to the standard micrometer for repeatable measurements.

Replacement cases cannot be sold to Canada due to import regulations.