to activate the motion SENSOR.
The Big Bang Theory Season 5, Episode 2
This is a sub-sonic impact SENSOR.
The Big Bang Theory Season 1, Episode 11
controlled by a seismic SENSOR.
Money Heist Season 3, Episode 3
...and the SENSOR apparatus will rest on it.
The Big Bang Theory Season 1, Episode 12
HOWARD:
Told you the SENSOR would work.
The Big Bang Theory Season 1, Episode 11