The invention relates to a test device for dispensing a substance into a medium, comprising a chamber for receiving a substance, with a closed end and a nozzle arranged therein, a piston for closing an open end of the chamber, an actuation device and a drive, wherein one or more components can be varied: a) wherein the closed end (7) of the chamber (4) is designed to be exchangeable with different nozzles (6)； b) the distance of the lower end (14) of the actuation device (11) from the rear face (15) of the piston (10) is designed to be modifiable； c) different drives (12) are used, d) the chamber (4) is made of different materials and/or different dimensions. The invention further relates to an associated test method and to the use of the test device for carrying out the test method.
