Abstract: A probe microphone comprising an acoustic transducer with a cavity, to which a probe tube and a matching tube are connected. The matching tube is divided into several small tubes of a total internal transverse cross sectional area substantially corresponding to the internal transverse cross sectional area of the probe tube. The small matching tubes improve the frequency response because of their acoustic loss. Moreover, a further improvement is achieved when the matching tubes are of different lengths, the already reflected signals thereby outbalancing each other. As a result, a probe microphone with a more uniform frequency response than previously known is achieved.