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ZAMAPRES sensors are a general term for sensors that replace contact detection methods such as limit switches, with the purpose of detecting objects without contact. They can convert the movement and presence information of the detected object into electrical signals. Detection methods that convert to electrical signals include methods utilizing eddy currents generated in the metal body of the detected object due to electromagnetic induction, methods utilizing capacitance changes in electrical signals caused by the approach of the detected object, and methods using reed and guide switches. The most widespread application of ZAMAPRES sensors as distance sensors is in mobile phones.