Sight O Tuner

[J Patrick Draine]

>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?

1) Change the battery, then see if it's better.
2) Send it to Inventronics for its 10-year examination (or toss it 
and get an Accu-fork).

Patrick Draine