I have a dynanometer, and I get it to show Error with my right hand. Left hand is about 85kg. I can squeeze (on good day) #3 Iron Mind (right hand), and #2.5 (left hand). Been gripping (but mostly that) for the last 3-4 years, though lots lots of muscle while diagnosed with diabetes II, almost year+half ago, and started low-carbo/keto diet (now I'm from 11 -> 5.6 without medication).
Don't feel super-strong, can do few pull ups, few dips, dozen of push ups and I'm more than 40. Also hate running, hate it since the army...
Point is, I'm skeptical of grip training ~ health. Or maybe if you've over-trained for that aspect, it may be lying...