I haven't heard of other "standards" before other than the A4=440 Hz.
I have read somewhere that in Mozart's time a typical A4 was 450 Hz, but it
has been standardized in 1939 as 440 Hz (Source:
http://www.boulder.nist.gov/timefreq/general/glossary.htm
).
That page also states that the smallest noticable difference is 0.28%, so that
gives at least some headroom :o)

So I should make my tuner tunable for other scales too :o)

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