List, We use a Hale Sight O Tuner in our rebuilding shop, they are great for chipping pianos w/o the action. The other day we checked it against the tuning fork and found it to be almost a half step flat. The Sight O tuner is an older one and was recalibrated about ten years ago. I have to plead ignorance in this case, is it possible for these to go flat like that and how often should it be recalibrated? Is it perhaps another problem? Thanks, Ed Mashburn, RPT
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