For use when head is on motor.
When installing the new springs that you have tested on the Rimac bench spring tester, use your Wizard on-head spring tester as a comparison. For example, the Rimac shows 475 lbs and the on-head tester shows 425 lbs. After you run the motor, the Wizard on-head spring tester might show 405 lbs. This would indicate your spring has lost 20 lbs. If you tested that spring on the Rimac again, it would show 455 lbs. The angle of attack is very important. It helps when the same person operates the spring tester on the motor because the process is a touchy-feely thing.