pitch pipe

n.
A small pipe that, when sounded, gives the initial pitch for a piece of music or the standard pitch for tuning an instrument.

A wooden pipe with a variable and graduated stopper, which when blown gives any desired note of the scale as marked on the stopper. They were used principally in Britain in churches that had neither organs nor gallery bands for giving the starting-notes of metrical psalms. Surviving specimens date from c 1750 to 1850; a typical pitchpipe might be of mahogany, with a scale c′-c″ or e′-e″. There are two types: in one, the fipple is shaped like a recorder's and the plunger is of soft wood with an inlaid, stamped pewter scale; the other has a central turned fipple and a mahogany plunger with an inlaid boxwood scale.

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The noun has one meaning:

Meaning #1: a small pipe sounding a tone of standard frequency; used to establish the starting pitch for unaccompanied singing

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pitch pipe