A measuring device for measuring the acoustic properties in milk, such as acoustic damping and sound velocity, in order to determine milk properties, includes a chamber 1 into which the milk is filled, a piezo element 13 to transmit first vibrations into the milk, and a receiver 12 to convert the first vibrations passed through the milk into first measurement signals. A reference or calibration measurement on vibrations that have been directed by the piezo element 13 into a wire 10 of known material strung in the measuring chamber 1 to be immersed in the milk, and received and converted by receiver 12 is also performed, the measured signals being processed by a processor 14 to derive a calibrated milk temperature, milk sound velocity, and other milk properties, in particular the fat/protein composition, which can be determined in a more reliable manner from the calibrated measurements. The vibrations are sonic or ultrasonic vibrations with a frequency extending between 10Hz and 200MHz, more particularly between 10kHz and 10Mhz. An alternative to the stretched wire 10 is an elongate bar element extending into the milk in the chamber.
