VisorMag is a clip-on magnifier, that attaches to the brim of most caps and hats. Perfect for fly-tying and all fly-fishing needs. Complete with protective soft-pouch. MANY OUTDOOR USES.
clip-on magnifier

Available in two powers:
VM-!0   1.75X (3 diopters)  $10.95
VM-12  2.00X (4 diopters)  $10.95
clip-on magnifying glass