RS Hydro stocks various ultrasonic level sensors that withstand corrosion, dust, moisture, extreme temperatures, and vibration, from manufacturers such as OCM3, HydroRanger, and EnviroRanger. Selections include the Siemens Milltronics MiniRanger Plus, a short- to medium-range single vessel level monitor for liquids and slurries with reliable measurements up to 15 m; and the Probe, an ETFE or PVDF copolymer-constructed device for monitoring liquids and slurries in open or closed channels, as are found in storage vessels, mud pits, and filter beds. Other products include the SITRANS Probe LU for flow, volume, and level monitoring, the HydroRanger Plus and HydroRanger 200 controllers, and more.