Häälevaljusmõõtur koosneb huulikust ja diafragmast, mille taha on asetatud õrn mehanism, mis olenevalt diafragmale mõjuvast hääle valjusest juhib tavalisse männilauda puuritud aukudega 15-tollist hooratast.
A phonometer consists chiefly of a mouthpiece and diaphragm. Behind the diaphragm is placed a delicate mechanism which operates a 15-inch flywheel by means of which a hole can be bored in an ordinary pine board.
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