Flux coordinating sensor

From Memory Alpha, the free Star Trek reference

A flux coordinating sensor was a hand-held device consisting of an upper section readout screen with four lights on the right and a lower section with ten buttons and five sliders. It was angled at its mid-point by about 30 degrees.

Wesley Crusher examined such a device in 2364 while in the Starfleet Academy testing area at the Relva VII starbase. (TNG: "Coming of Age")