If you build or repair your own leaders, Fishpond's Firehole Tippet/Leader guage is sure to become one of your most indispensable accessories. Machined from bar stock aluminum, this uniquely designed tool measures tippet material and monofilament line from 8X (.004) all the way up to .031 with pinpoint accuracy.
As a bonus, they've incorporated a hook eye clean-out pin into the design. Has a retractor/lanyard hole. Two tone anodized body available in assorted colors.