Disclosed is a method and a transit time tester for monitoring the transit time of an item to be conveyed, particularly a mail consignment, wherein the movements of a consignment are registered and stored in a transit time tester for later evaluation of the sequence of transportation. The method is applicable to systems that can be reduced to such a network, including telecommunication networks, traffic networks, computer networks, layouts, hydraulic networks, etc. On the other hand, the elastic member has a rigidity in an axial direction of the crankshaft small enough to shift a resonance frequency of a bending vibration out of a target frequency band of a forced vibration, while ensuring to prevent a failure of disengagement of the clutch. The images of the generated display image group are switched to display an image on a display unit.