CPC G01N 21/3554 (2013.01) [G04D 7/007 (2013.01)] | 10 Claims |
1. A device for measuring a relative humidity level inside an enclosure of a case of a watch, the device comprising:
an emitter module provided with a source of light radiation capable of emitting light beams towards the enclosure of said case;
a receiver module for receiving at least one acoustic signal from said enclosure, and
a control unit connected to said modules- and which is configured to evaluate a water vapour content of a gaseous fluid contained inside said enclosure as a function of said at least one acoustic signal received by the receiver module.
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