Answer: detectors

AnswerCrossword Clue
DETECTORSIdentifiers
DETECTORSDevices for locating submarines.
DETECTORSRadar and sonar.
DETECTORSSensors
detectorsA device or instrument designed to detect the presence of a particular object or substance and to emit a signal in response
detectorsDETECTOR, one that detects, also DETECTER