If your daughter cannot provide, County Comm sells a 'training version' of the GI lensatic compass for $11.50 plus the gig for shipping. Standard disclaimer and I have no experience with this particular model.
http://www.countycomm.com/trainingcompass.htm The difference with that one is that it is liquid damped rather than induction damped like the real one. Should be fine to test the lens arrangement, though.
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- Tom S.
"Never trust and engineer who doesn't carry a pocketknife."
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