I have come up with a different workout (more on that in another post) that I will be alternating with my existing one and it includes deadlifts. After such a long layoff, of course my grip strength isn't what it used to be and I know it will soon be lagging behind what my legs and back can handle. I have found that the best way to increase my grip strength is to do deadlifts (or whatever) followed a session with my Ivanko Gripper. The DL works the grip indirectly, fatiguing it, and the gripper session works the grip directly.
This time, though, I know I need to start light with the gripper and increase gradually or tendonitis will soon follow (my forearms are especially prone to that). The Ivanko Gripper has this two-spring setup that is great but increasing linearly isn't straightforward (and it sure didn't come with instructions way back when I got it 25-ish years ago). Fortunately, someone has already worked that out. Behold, Drew Baye's Ivanko Super Gripper Resistance Chart. It is, seriously, one of the most useful weight training things I have ever seen.