The new KOBOLD flow meter type DPR works according to the baffle plate principle. A very small mounting length of only 50 mm can be implemented with the sandwich construction. A plate (semi-circular) is fastened to a rotatable axis in the 50 mm thick ring. The angle between plate and ring changes according to the flow throughput. A permanently attached magnetic coupling transfers the motion to an external indicator. A torsion spring forces the baffle plate back to its original position when the flow throughput decreases. The devices can therefore be installed in any position.