Flux coordinating sensor
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 Federation facility. Oliana Mirren asked him what it was,
and promised not to tell on him for touching it. ()
Sensor technology