The invention provides a measuring device for measuring the acousticproperties, such as acoustic damping and sound velocity in milk, in order todeterminemilk properties. Said sound velocity in milk depends on temperature andcomposition.By carrying out, for example by means of a piezo element 12, a referencemeasurementon vibrations that have been directed by a second piezo element 13 into a wire10 orthe like of known material, which wire 10 is strung in the measuring chamber 1which isfilled with the milk 5 to be tested, the milk temperature can be derived, sothat other milkproperties, in particular the fat/protein composition, can be determined in amore reliablemanner.