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Since you appear to be in the UK, let me recommend a vulcan adjustable gripper from David Horne. here is a link: http://www.davidhorne-gripmaster.com/shop.html#vulcan

I have about 40 different grippers, including some customs I have made or modified, I also have a PDA modified Super Gripper they call the Devils Advocate, and one of these Vulcans among other gripper type equipment. The Vulcan is right up there as far as one of my favorite pieces of equipment.

- Aaron

There is quite a bit of variance. It only gets worse the bigger they get too. For the grip contests we actually calibrate the closing pressure of the grippers using a method which basically hangs weights from a strap on the end of the handle. For the #4's I've tested from easiest to toughest that poundage variance is about equivalent to the difference in poundage between an average #2 and average #3 gripper. So that is a pretty big spread IMHO. Some numbers for comparison, using the RGC scale (redneck gripper calibration) with the pressure tested out on the end vs the middle of the handle like most of the manufacturers use for their claims.

Average closing pressures for Coc grippers: #1 - 83#, #2 - 110#, #2.5 - 130#, #3 - 150#, #3.5 - 179.5#, #4 - 209#
Variance for #4: 190# - 230#

I've closed a 194# - #4, 195# for another brand, and come within a hair of closing a 199# - #4. Around the time I first closed the 194# - #4, I got 21 reps on a #3 in a rep test and 6 reps on my #3.5. The amount of reps on a gripper to close the next one above it can vary quite a bit from person to person depending on muscle type and training style though. As a result reps are not usually a good indicator for whether you can close the next one up.

- Aaron

I actually prefer the Tetting grippers myself. I like the way they load up and the heavier sharper knurling. They can vary as much as the Coc's though once you get into the bigger ones due to slight differences in mount, spread, spring temper, etc. Thats one reason why I have so many grippers, to be able to do small jumps between them. I also modify the Tetting's to allow for easy change in handle mount depth and sell them as adjustables to make up for those differences and allow for incremental progress. If you interested in typical RGC numbers for each of the Tetting gripper series let me know and I can see if I can get those posted as well.

- Aaron