... , the controller can operate it.The controller make the contact switch work through magentic, control level which liquid level change frequently ... same pole, magnet in the enclosure swings oppositely to drive switch close or open. Specification; Operating pressure: 1.0, 4.0 ... AE.run.minisite.productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); multifunction level switch