Electronic test instrument (12)
I believe the answer is:
oscilloscope
(Other definitions for oscilloscope that I've seen before include "Laboratory device for viewing waveforms" , "Laboratory instrument" .)
I've seen this clue in The Guardian.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.