Abstract: The invention relates to a calibration apparatus for control of propellant pumps, especially in the traffic sector, which apparatus is placed on a vehicle, especially a trailer. The apparatus (1) has at least one standard (10) for measuring a determined amount of propellant, and the standard is placed in a cardan suspension (49-52) which is elastically yielding (48) and may be locked during operation and during transport by means of supporting rods (53-59). A standard (10) is divided into a lower measuring compartment (11) and an upper foam top (14) which is connected tot he measuring compartment (11) through a neck (12) with a measuring glass (13) and reading lines (22). The foam top (14) is ventilated (35-37) to reception tank (5) placed at the bottom of the apparatus (1), and the standard (10) may be connected via a remote controlled discharge valve (20) to the reception tank (5) from which propellant may be pumped up into a buffer tank (64) at the top of the apparatus (1).