MAGNASPHERE AS FERROUS PROXIMITY SWITCH ALTERNATIVE: Only Stand-alone technology to function as a ferrous proximity sensor. Reed and Hall switches need a biasing magnet. Lowest Cost Ferrous Proximity sensor available. Can be packaged as direct replacement for Inductive Prox. Spherical contact is a MAGNET. Responds to ferrous metal. Needs no magnet actuator. Air gaps of up to 125 in. NEXT >> MERCURY TILT SWITCH