SF50 Vibrating Level Switch For Powders and Granulars Solids Product Features Acceptable for Most Powdery and Granulated Bulk Materials Accepts Universal Input Voltage Modular and Simple Design Maintenance Free No Calibration Required Self Cleaning Robust Fork Design with Pantented Piezo Crystal Sensing Element Options for Mounting Plate / Flange or Extensions to 156 inches (3962 mm) Options for a General Purpose Indicator Light