![Suburban Tool - 13-3/4 Inch Diameter, Screw Thread, Mylar Optical Comparator Chart and Reticle - 4 to 80 TPI Scale Value, For Use with 50x Magnification - Exact Industrial Supply](http://exactindustrialsupply.com/cdn/shop/products/0002129A-11_5c3a71c3-b9c3-49ec-8c1d-95c97dbb4a36_1024x1024.jpg?v=1586019747)
Suburban Tool - 13-3/4 Inch Diameter, Screw Thread, Mylar Optical Comparator Chart and Reticle - 4 to 80 TPI Scale Value, For Use with 50x Magnification
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