![Suburban Tool - 13-3/4 Inch Diameter, Screw Thread, Mylar Optical Comparator Chart and Reticle - 7 to 80 TPI Scale Value, For Use with 20x Magnification - Exact Industrial Supply](http://exactindustrialsupply.com/cdn/shop/products/0002129A-11_74acfc91-0856-4cb6-ab9d-9566e76aa707_1024x1024.jpg?v=1586021218)
Suburban Tool - 13-3/4 Inch Diameter, Screw Thread, Mylar Optical Comparator Chart and Reticle - 7 to 80 TPI Scale Value, For Use with 20x Magnification
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