Flip Focal Clip-On Magnifier - 3.50X
Here is an optical aid that is convenient when you need it - just clip it to the brim of your cap. Flip it up under the brim when it's not in use, or clip it to your fishing vest if you're on the water. Comes with a choice of 2.50X or 3.50X magnification. It weighs less than 2 oz. and comes with a soft carrying case. Made in USA.