device - an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"

metal detector - detector that gives a signal when it detects the presence of metal; used to detect the presence of stray bits of metal in food products or to find buried metal

mine detector - detector consisting of an electromagnetic device; used to locate explosive mines

electric eye, magic eye, photocell, photoconductive cell, photoelectric cell - a transducer used to detect and measure light and other radiations

trace detector - a screening device for traces of explosives; used at airline terminals

radio receiver, radio set, receiving set, tuner, radio, wireless - an electronic receiver that detects and demodulates and amplifies transmitted signals

rectifier - electrical device that transforms alternating into direct current

crystal detector - a detector consisting of a fine wire in contact with a galena crystal; acts as a rectifier

electronic equipment - equipment that involves the controlled conduction of electrons (especially in a gas or vacuum or semiconductor)

radio receiver, radio set, receiving set, tuner, radio, wireless - an electronic receiver that detects and demodulates and amplifies transmitted signals

electronic scanner, scanner - a radio receiver that that moves automatically across some selected range of frequencies looking for for some signal or condition; "they used scanners to monitor police radio channels"