Submicron scanner

From Memory Alpha, the free Star Trek reference

A submicron scanner was a type of engineering tool.

In 2370, Lieutenant B'Elanna Torres used one while trying to construct a prototype Automated Personnel Unit. (VOY: "Prototype")

The prop was originally created for the movie Men in Black (as an alien handgun) and was later re-used as a Srivani medical device in "Scientific Method".