Good: Rogue Cannonball Grip System: Train your grip for pullups or attach to a barbell or other objects to train your grip with other movements.
Better: Rogue Grandfather Clock Grip System: An even more difficult test of grip strength than the cannonballs. Resembles the weights in a grandfather clock.
Best: Rogue Pinch Grip System: Test and build your pinch grip strength. Like the other grip systems, you can attach these to nearly any object to work on your grip strength with several different movements.