Once you’ve defeated the black Gripmaster, you’re ready for a “big boy” hand exerciser.
The “Captains of Crush” hand exercisers are great products. They’ve been on the market for about 15 years now and are quite popular in bodybuilding, powerlifting, and strongman circles.
You have 11 strength options to choose from, ranging from 60 lbs to an incredible 365 lbs. Most people find they need to start with the Guide or Sport models (60 and 80 lbs of strength required to squeeze, respectively), but if you’re an experienced weightlifter that can deadlift over 300 pounds for reps without straps, you can probably start with the Trainer model (100 lbs) and be fine.