I am strictly an aural tuner.I use an "A" 440 fork,and an "A" 442 when required.I use them both for "A" 441. i.e. f-a 10th beats faster than 440 and slower than 442.I am considering purchaseing an "Accufork" so I can be more exact with 441 and some of the even stranger requests like 441.5. Robin Olson RPT
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