A testing apparatus for testing vaporizers of electronic cigarettes, or electronic cigarettes or parts thereof comprising the vaporizers, comprises a movable holding construction part provided with multiple holding units each for holding a vaporizer, or electronic cigarette or part thereof comprising the vaporizer. A channel construction part moves synchronously with the holding construction part and is provided with multiple first channels. An inlet opening of each first channel is in fluid communication with a vapor output of a vaporizer in an associated holding unit. The outlet openings of the first channels move along an outlet opening trajectory. A fluid duct has a stationary inlet port adjacent to the outlet opening trajectory. The fluid duct is connected to a fluid pump to create a fluid flow in the fluid duct in a direction away from the inlet port. A vapor sensor is arranged in the fluid duct.