HXF-D Made of molded,chemical resistant P.P. Specially designed to slove the longdistance multi-level detection. Contact component is Micro switch. HXF-E Made of molded,chemical resistant P.P. Specially designed to slove the longdistance multi-level detection. Contact component is Micro switch. HXF-Q Made of molded,chemical resistant P.P. Specially designed to slove the longdistance multi-level detection. Contact component is Micro switch.