Eagle Spectrum Air Test From 1991

[Steve Herschbach]

I just finished scanning and uploading the rare Engineering Guide to the White's Eagle Spectrum from 1991. A true innovation in detecting, one of the first digital models, and the first with what became the White's SignaGraph display. 28 page free download so check it out.

Page 17 caught my eye as something we do not see these days. And actual factory produced air test/calibration chart for the Eagle Spectrum. It gave owners an easy way to see if their detector was performing to factory spec. It better serves here to show just how far we have come since 1991 in detector performance. Or not, depending how you look at it.