Micro-caliper mine

A Starfleet micro-caliper

A micro-caliper was a small tool.

While attempting to diffuse a Romulan mine that had attached to Enterprise's hull in 2152, Captain Jonathan Archer used a micro-caliper to work on the mine. (ENT: "Minefield")

An ultimately omitted moment from the final draft script of "Minefield" would have established that Captain Archer was at first unsure what a micro-caliper looked like, until Reed identified it for him in a toolkit. One of the details Reed gave to guide Archer was slightly different from how the micro-caliper ended up looking; it was said to have green handles, though the tool's handles are colored a metallic-silver in the installment. In the script, the tool was also identified as having a span of two centimeters and being the second smallest implement in the toolkit. In a scene description immediately thereafter, the micro-caliper was referred to as "a small, delicate hand tool."

Also in 2152, Commander Tucker used a micro-caliper to adjust a component on a 31st century communications beacon. (ENT: "Future Tense")

In 2374, Entharan arms dealer Kovin used a micro-caliper to remove the guidance system casing of his thoron rifle while showing it to Seven of Nine. In Seven's false memory where he assaulted her, Kovin used the micro-caliper to remove her ocular implant. (VOY: "Retrospect")