In addition to using a permanent magnet to actuate a reed switch, MEDER electronic has also designed a patented bridge metal detection sensor. The MK02 Series will detect the presence of a magnetically conductive material. The sensor is mounted to a fixed object and as the magnetically conductive material moves into proximity with the MK02 sensor, the reed switch actuates. This sensor is commonly used in door sensor applications or other metal detection applications requiring a rugged package in either panel mount or surface mount.