Abstract: Apparatus for testing non-rotationally symmetrical hollow bodies for defects includes a conveyor for continuously conveying the hollow body through a test region past a detector for producing measurement values characterising the nature of the respective hollow bodies being tested, in dependence on the angle of rotation of the hollow body. An evaluator device compares the measurement values to predetermined values to decide whether the respective hollow body being tested suffers from defects. The conveyor has a receiving device which is fitted over the respective hollow body to embrace it. The receiving device with the hollow body is rotated through a predetermined angular amount while the hollow body is being transported past the detector device. The receiving device is removed from the hollow body again in the region where the conveyor conveys the hollow bodies out of the test region.