Ace Archery Tackle Spine Master (Model 203)

Just what wooden arrow users have been waiting for - easily and accurately test the spine of your wooden shafts. Features: Conveniently mounts on your wall Engineered to give accurate spine and deflection readings Reads 25 to 100lbs and .200 to .900 inches of deflection Works with shafts from 5/16" to 23/64" Easy to setup and use Constructed from durable steel and brass