RE: Hand Grips
when I got the HG100 I could close it with my right about 3times and 0times with my left. After a few months managed to get up to 20reps on each side. Bought the 150 and could close it at all. Can probably bash out 6reps a side now and thats 4months later.
I'd say unless you have done grip training previously or your naturally massive you wont be able to close the 150.