A device for measuring a fuel flow in a test stand comprises a measuring module (10) for measuring a fuel flow guided through the measuring module (10) as well as a conditioning module (11) arranged downstream of the measuring module (10) for conditioning the fuel. Moreover, a verification module (19) is provided downstream of the measuring module (10) for checking the measuring precision of the measuring module (10). The fuel may be guided optionally to the conditioning module (11) or to the verification module (19). The verification module (19) is an integral part of the device may have an injector (26) as a dosing unit for extracting an exactly defined reference fuel quantity.