Scales Grips

How to improve grip strength?

I measured my pinch grip strength by squeezing a scale. Is that a good way to measure? I only exerted 80 lbs with one hand. How can i increase that?
It is to increase performance in bouldering, boxing, weight training, and tennis.

I couldn’t find the exact picture I was looking for, but it’s something like this at the gym

http://www.shapeupshop.com/fitness/gymacc/forearm_blaster.htm

You stack weighted plates on it and squeeze the upper section together to increase hand/finger strength

Theres also these things that work, called hand grippers

http://www.leehayward.com/heavygrips.htm

Becker BK2 BK7 Scales Bocote and Cocobolo

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