Magnetic pickup coil mounted in a plastic 1/4" threaded housing. The threads allow for optimum adjustment to bring the coil close to a magnet that is passing by. The magnet zooming past the coil, induces a pulse in the 140 Ohm (dc) coil, which can be detected by the Hubble Telescope or some other device. These are a good part to be used in UFO detectors.
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