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 particle beam 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")