The invention relates to a testing device (1) for measuring a transmittance and / or homogeneity of a gaseous and / or liquid-permeable filter (14) or catalyst, in particular a filter (14) or the catalyst of an exhaust gas tract of a motor vehicle. According to the invention an optionally flexible housing (2) having a first gaseous and / or liquid-permeable end (3) and a second end (4) and at least one inside the housing (2) arranged pressure sensor (5) and at least one regulating device (6) provided, with the control device (6) air and / or a liquid with a variably adjustable volume or mass flow or pressure to the first end (3) of the housing (2) and / or with a variably adjustable volume or mass flow or vacuum of this has gone to transport. With a test device according to the invention (1) can be accurately detected with a simple formation thereof a transmittance and / or homogeneity of the filter (14). Furthermore, the invention relates to a method for measuring a transmittance and / or homogeneity of a gaseous and / or liquid-permeable filter (14) or the catalyst.
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