A new uroflow measuring instrument produced in the GDR by W. Rentsch , the Uroflow -Recorder URO-103, is presented and compared with thermistor and capacity-measuring apparatuses. The Uroflow -Recorder gives strictly linear measurements and requires extremely little maintainence . Over the test period of 8 months it functioned free from disturbance. The new apparatus is recommended for use, whereby it is suitable for combined urodynamic measurements.