The RFS model from KOBOLD is a high-quality level switch that developed for monitoring filling levels of liquids economically. The liquid must not include solids and not metallic particles. A pivoted stainless steel float with an inserted solenoid progress up and down together with the filling level of the liquid. The device is usable with the medium temperature from -40 °C up to 120 °C and the ambient temperature from -20 °C up to 80 °C.