A calibration device for mass flow meters including a test piece measuring section into which the mass flow meter test piece to be calibrated can be inserted, a device for creating a flow of a medium through the test piece measuring section and a temperature-measuring device positioned in the test piece measuring section for detecting the temperature of the medium. The temperature-measuring device is position in the flow such that the flow is disturbed as little as possible, while at the same time being capable of highly-accurate detection of the temperature of the flowing medium. In particular, the temperature-measuring device is an ultrasonic temperature-measuring device that is configured to emit an ultrasonic signal into the medium and determine the temperature of the medium by measuring a speed of the emitted ultrasonic signal.
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