The PDF-1000 is a Vector Trek model made by Neil Pagal. Fitzgerald is just the peddler. I own a PDF-1000 but don't have the design details here in front of me.
The crystals are probably 100ppm which is pretty common. Someone who doesn't know what that means might claim an accuracy of 1/10,000 Hz but that only works if the output is 1 Hz. The "doesn't know what that means" only gets worse from there.
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