Description

This article is from the Piano Purchase and Maintenance FAQ, by Isako Hoshino rmmpfaq@yahoo.com with numerous contributions by others.

9.1] Why use an electronic pitch device instead of the traditional A-440 tuning fork? (Piano Purchase and Maintenance)

Electronic tuning forks are quite accurate and some piano
tuners use them to replace the old-style metal forks, which
are highly subject to temperature changes which make them
"drift" from the standard.

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