The MN03 from Riels is a high-quality level indicator membrane which is mainly used handling control, solid control and granulate dosing that includes feeds, flour, plastic granules, lime and chipboard. This device is capable of reporting the reached level by the materials due to the pressure applied on the apparatus that is transferred into a micro switch. The device is very easy to use because of it is fully automatic and it does no need extra power supply. A register screw and compression spring can adjust the membrane’s tension.