An indicator showing the depth of the water in a boiler. / A galvanometer, usually portable, for indicating the direction of a current.

plural of detector

The hobby of using a metal detector to search for buried coins, etc.

A device that provides an alarm to inform its user(s) that lightning has occurred nearby. Specific devices are available for a variety of applications.

A hand-held device that uses electromagnetic induction to detect buried metal.

(physics) A device in which the detection of radiation takes place at the depletion junction of a reverse-biased semiconductor junction.

A device that sounds an alarm when it detects smoke or other evidence of fire.

(electronics) A special type of comparator which provides an indication of whether the input voltage is within a specified range.

plural of lightning detector

(Britain) A vehicle equipped with electronic instrumentation that can detect the oscillator of a domestic television, used by the licensing authority to check that a household with no TV licence does not have a television receiver