Goldilocks Screw Gauge™ #2059 – Western Optical Supply, Inc.
Amazon.com: Ruelle Screw Chek'r SAE/ Inch Screw Thread Size Gauge (No. 1 to 5/16) 1/8 Inch Heavy Gauge Steel Screw Checker, Made in USA : Industrial & Scientific
Screw Gauge (English) , How to determine the thickness of a copper wire - YouTube