- Spine tester to optimize arrow flight by locating spine of arrow
- Uses spring tension over dead weight for more consistent and accurate readings
The Coop's Spine Tester allows an archer to index tehir arrows so the spine is at the top of the shaft for increased consistency and flight. The tester uses spring tension over dead weight for a more consistent and accurate reading. Also incorporates a built in arrow spinner so an archer can tune their broadheads.