The OptiVISOR is manufactured in six different powers for use in different applications.  The number in the upper left-hand corner of the lens plate indicates the approximate diopter power of the lens.

Lens Plate Number Magnifies Focal Length
2 1 1/2  Times 20 Inches
3 1 3/4  Times 14 Inches
4 2 Times 10 Inches
5 2 1/2 Times 8 Inches
7 2 3/4 Times 6 Inches
10 3 1/2 Times 4 Inches


Discover a great variety of Interesting, Informative and Fun Jewelry Making Classes !

You can now sign up for classes online!


Our Extended Validation SSL certificate provides you with the highest degree of assurance that Armstrong Tool Supply Co. is a verified and trusted business and that your transactions are secure