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David,
Did you buy an authentic Lenspen, or one of the ones which use the Lenspen trademark, but, are Barska branded?
I've been in touch with the makers of Lenspen, awaiting a reply, but, my impression is that the Barska ones are Chinese clones which I wouldn't touch with a barge pole.
The safest bet is to purchase directly off their web site. Might cost more with postage, but, at least you know you're getting the real deal. Having said that, and, not owning a reflector, I think it makes sense not to use Lenspens on anything as precious as a telescope mirror with coatings.
Regards,
Humayun
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