26 Jul GRAFCO USA Tuning Fork 512C Diagnostic Sound 9A
For sale is a grafco 512C tuning fork....
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26 Jul GRAFCO USA Tuning Fork 512C & McCoy Tuning Fork 128C – lot of two – used
Lot of two different diagnostic tuning fork. Both are in very good used condition. Grafco USA tuned to 512C McCoy tuned to 128C...