Went to my favorite local sporting Goods store to pick up another RF Signal Mirror, offered by Adventure Medical Kits I believe, and found the surface of the mirrors in stock were all covered with black spots. The clerk took them off the rack and said he would return them. He suggested I check my existing mirrors and bring them back if they were also tarnished. You may want to check yours as well.
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Regards,
Al
Age and Treachery will overcome Youth and Enthusiasm