pitch pipe
Noun
Meaning
a small pipe sounding a tone of standard frequency; used to establish the starting pitch for unaccompanied singing
Source: WordNetSynonyms
baton
metronome
stick
mute
diapason
tuning fork
piano tuner
piano tuners
tuning forks
harmonic rods
pitch pipes
tone generators
tuning fork type
tuning forks and pitch pipes