Amazon.com: The Beadsmith Rectangle Wire Gauge – Premium Gauge Sizer – Laser Cut Slots and Marked in Imperial Standard Units: 1-36 and Millimeters – Flat Ruler for Determining Wire and Drill Bit
Cable length measuring devices
Brass Caliper - Gemstone And Bead Measuring Tool: Wire Jewelry | Wire Wrap Tutorials | Jewelry Making Wire
How to Use a Wire Gauge Tool - YouTube
Project 0129 | Making a Cable/Wire/Rope length measuring tool - YouTube