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It's purely descriptive: the item is fork-shaped and is used when tuning musical instruments.
You can purchase a tuning fork on E-bay or any store/shop that sales musical instruments; such as pianos!
Tuning Fork.
J. Murray Barbour has written:
'Tuning and temperament' -- subject- s -: Tuning, Musical temperament
Although the tuning fork is not usually thought of as a musical instrument, technically, it would be classified as a percussion instrument.