The Ace Archery Spin-Spine Tester measures by ATA 26" centers or Easton's 28" centers to test any arrow shaft of carbon, aluminum, or wood. Included with the Spin-Spine Tester are a 2 lb weight and a 1.94 lb weight. These weights allow you to measure arrow shaft spine from 25 to 150 pounds and deflection from 0 to 1.00 inches.
Features a large, easy-to-read scale. Spin your shafts on ball bearing bushings to check shaft straightness and point/nock alignment. Instructions included.