Crystal Calibrator question

[spalletta]

dose anyone know what does a Crystal Calibrator 
<http://cgi.ebay.com/Drake-2-AC-Crystal-Calibrator_W0QQitemZ160219504916QQihZ006QQcategoryZ4673QQssPageNameZWDVWQQrdZ1QQcmdZViewItem> 
do and how it used? Thank s Phil 73s
K1PAS

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