The invention relates to a test device for confirmation of a cleaning effect of a cleaning device for a hollow medical device, in particular an endoscope, comprising a housing defining at least one test channel to be connected to a cleaning fluid feed line of the cleaning device, wherein said housing defines a location for mounting a plate shaped indicator in the test channel, characterized in that the test device comprises multiple test channels, and in that the indicator comprises a test surface having one or more test samples, wherein the one or more test samples on the test surface of the indicator, when mounted on the mounting location, are arranged in the multiple test channels.
