A device for measuring and displaying one or a plurality of characteristic parameters of water flowing through the spout of a sanitary valve is formed as an integral self-contained unit. The unit comprises a housing formed with an axial passage. One or a plurality of sensors responsive to the parameters of interest communicate with this passage. The value of the parameter of interest, particular the temperature of the water, is displayed by a display unit also integrated into the housing of the device. A connecting stud of the housing can be screwed into the outlet opening of a standard sanitary valve.
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