Since most people are familiar with the Captains of Crush hand grippers, I'll give you a very simple way to understand how the resistances stack up.
With the springs in the easiest level, the Ivanko Super Gripper is comparable to the "Guide" gripper, the lowest resistance hand gripper in the Captains of Crush series of grippers. With the springs in the hardest level, the Super Gripper's resistance compares to the Iron Mind COC #3.5 or #4, and you would be hard-pressed to find anyone who could close it on that level.
Of course, if even the hardest setting is not tough enough, you can always choke up on the handle!
With two springs on the Ivanko Super Gripper, there are over 50 different settings to choose from, meaning that you can replicate all the resistance levels afforded by the Iron Mind COC grippers. Keep in mind, though, that regardless of the resistance, Super Grippers and hand grippers have very different "feels" to them and can be used together effectively for variety and excellent results.
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