A gentle measurement method without influence on the respiratory tract: the Oscillatory Resistance measurement answers the central question for the current degree of obstruction immediately and practically without the patients’ cooperation! When measuring with ROS-BOX, “normal” tidal breathing replaces the strenuous, cooperation-depending, and error-leading breathing manoeuvre. Oscillation volumes in the range of millilitres make fixing of the cheeks unnecessary. Compared to the usual measurement methods, the bronchial system is practically not being stressed. . Continuous measurement of the breathing resistance during tidal breathing . No qualified personnel necessary for the instruction of breathing manoeuvres . Direct measurement at a high resolution shows the resistance curve almost instantly . Gentle measuring method with almost no impact on the respiratory system . Especially suitable for use in a paediatric practice . Available as an option for PowerCube and SpiroScout or as a stand-alone device