Hydrophonum[1] vel hydrophonium[1] est machinula microphonum similis quae sono audiendo aut incidendo sub aqua adhibetur. Plerumque hydrophona in transductore piezoelectrico acta sunt, quo electricitatem generat quando mutationem pressionis sentit.
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/8/80/Underwater-microphone_hg.jpg/320px-Underwater-microphone_hg.jpg)
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