The FlowFinder © MK-2 has been developed to accurately measure air quantities using the so-called zero-pressure technique. In order to guarantee better accuracy independent of application or conditions, fundamental research Appeared to be the missing link. By developing a thorough understanding of the physics behind the FlowFinder ©, it Appeared possible to improvesleep upon the current model. But more fundamen tally usefull base certitude can be given about the working principles and the accuracy.