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.
That's just a Brunton 9077 without marking, no need to go through county comm to get one.
Edit actually it's not, but but close enough you can get a brunton from local store to play with.
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