When accuracy is the difference between winning and losing, there's one test spring kit that's a cut above the rest...the RIMAC calibrated 3-in-1 test spring kit. This spring kit include three test springs: a lightweight spring, a medium weight, and a combined heavy weight spring giving you an approximate test range from 10 - 640 lbs. Data sheet included. Super accurate and individually tested on an Instron SF1240 testing machine.
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