The SmartBob2 SS for measuring submersed solids from BinMaster Level Controls is an affordable measurement system that provides the level of solid materials that have settled on the bottom of a tank of liquids. An alternative to sight tubes, the sensor mounts on the top of the bin and works like an automated tape measure. The sensor operates by dropping a cable with a weighted stainless steel probe that penetrates the liquid and descends to the solid material surface in the tank. When the probe comes into contact with the solid material, it automatically retracts and sends a measurement to either a C-100 control console mounted at ground level or to a personal computer loaded with Binventory software. A standard 4-20 analog output can also be used to send data directly to an existing control system. 800-278-4241; www.binmaster.com