Visual Precision
- Optical Comparator replacement charts
- Glass, Vinyl or Mylar Overlays

No. 1
Combination Radius & Grid Chart

No. 2
Grid Chart

No. 15
Glass Protractor Rim Chart
Glass protractor rim chart marked every 5 degrees graduated every 30 minutes "0" to 360 degrees shown. Available in all diameters up to and including 30.75" diameter.
Glass protractor rim chart marked every 5 degrees graduated every 30 minutes "0" to 360 degrees shown. Available in all diameters up to and including 30.75" diameter.

No. 29
American National Basic
Thread Form
For checking thread angles, root and crest-forms and depth, from 4 to 80 pitch thread, as defined in the Federal Standard Handbook H-28
For checking thread angles, root and crest-forms and depth, from 4 to 80 pitch thread, as defined in the Federal Standard Handbook H-28
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