Magnetic Transducers are used with magnetic alloys, and consist of a rare earth magnet surrounding a piezo electric crystal which is protected by a wear plate. The diameter used in the description of transducers refers to the nominal diameter of the piezo electric crystal; therefore, the O.D. of a transducer is larger than the crystal diameter due to the annular magnet and transducer housing. Standard transducers can be used on application with contact temperatures of up to 54°C (130°F). Hi-Temp transducers are available for applications with contact temperatures of up to 175°C (350°F). Special transducers are available for non-magnetic applications.