Useful calibrator, spring action tool to test and confirm pulling tension of any string puller, manual or electric, mechanical display. Including two strings, one on each side attached by Gefen Sports. How to test your string puller? Attach one string end to the swivel clamp in the middle of the turntable, lock the turntable, lock the base lock, attach the other string end to the string puller and let the string puller pull the string, then check the string puller reading and correct if necessary.
