Calibration
The concept of calibration entered the gripper world when IronMind compared the variation among grippers to the variations in "uncalibrated barbell plates", using the analogy of uncalibrated barbell plates to explain why there may be slight variations from one gripper to another.
Most barbell plates are uncalibrated, which means that they rarely weigh precisely the same as their face value, but a calibrated barbell plate must meet established criteria. In the gripper world, Strossen writes, some people mistakenly call a gripper calibrated when it has merely been rated for its level of difficulty.
Ironically, while IronMind introduced the idea of gripper calibration and discussed its limitations, Captains of Crush Grippers – especially the No. 3 Gripper – became the de facto standard by which other grippers were measured. In 2004, IronMind made some adjustments to its benchmark No. 3 Gripper to ensure that it conformed to its historical standards, making it a truly calibrated gripper.
Read more about this topic: Captains Of Crush Grippers