detecter

Noun

detector (plural detectors)

1. A device capable of registering a specific substance or physical phenomenon, and that optionally sounds an alarm or triggers a warning.
   • Smoke detectors are mandatory in public buildings.
   1. An indicator showing the depth of the water in a boiler.
   2. A galvanometer, usually portable, for indicating the direction of a current.
   3. A device measuring radiation or electromagnetic waves.