I bought one last year at Harbor Freight after years looking at $100.00 price tags for similar tools. I have not regretted the purchase and find it very accurate for leader building and fly tying proportions.
The micrometer is by Cen-Tech. Accurate to .0001". Item#00895. Go to your local Harbor Freight store or the web www.HarborFreight.com for more information.
Enjoy!