I am very pleased with this grip trainer! I had a different brand that I used for months but it snapped apart on me - so I was looking to get something more durable, and that is definitely the case for this product.

It adjusts from a range of quite easy to squeeze, all the way to quite difficult to squeeze -therefore it is a good product for people of all sizes and strengths.

I have used this for about a week now - probably a couple hundred squeezes per day when I'm driving in my truck to and from work, but I can tell this is high quality material and will last for a long, long time. Will update if something changes.

I've had my GD Grip Ultra 70 exerciser for a little more than 6 years. It is very durable. I especially like how the grip handles stay parallel throughout the exercise. Both the resistance and the grip size are adjustable. The front black knob adjusts the resistance while the silver wheel adjusts the grip size.

When the front knob is turned, the spring compression is changed, changing the resistance and moving the bolt forwards or backwards. That also moves the silver wheel the same distance which changes the grip width, which then must be readjusted. For instance, if the front black knob is adjusted 1/2 turn clockwise to increase resistance, that moves the bolt forward and compresses the spring. Then the silver wheel must also be turned 1/2 turn in the same direction to maintain the same grip width as before. Otherwise, increasing the resistance will decrease the grip width making it generally easier, while decreasing the resistance will increase the grip width which makes it generally more difficult. So, the key is to turn both the front knob and the silver wheel the same amount and in the same direction to keep the grip width the same while changing the resistance.

Turning the silver wheel to widen the grip will also increase the resistance. This occurs because as the grip gets wider, the cam pressing against it to compress the spring moves horizontally and feels the full force of the spring. When the grip is narrower, the cam moves at a more downward angle giving a mechanical advantage over the wide grip when compressing the spring. It also means that as the grips move closer together, the required force to close the grips becomes less. So, the resistance level isn't linear over the full grip range, though this isn't obvious when using the device.

Things that could be better:
1. The grips are hard plastic, and at higher resistance level might be a bit uncomfortable and a bit slippery. Workout gloves should help with comfort when needed and friction tape should help with slipperiness.
2. The front knob resistance adjustor doesn't stay set very well. It is just a nut on a bolt. When the grip is flexed, the nut moves forward and can easily turn on its own, changing the resistance. If you like to work with progressive resistance, that will undermine the effort. I wound Teflon thread tape around the bolt 15 or 20 times (it's thin) and then put the nut on. That gives it enough resistance to keep the nut/knob from turning on its own while still allowing it to turn easily for adjustment.

I highly recommend this grip exerciser for its stable, parallel handles during use, and for its resistance and grip width adjustability. It has a wide range of resistance, though the lightest resistance might still be too strong for many women and boys.

would of been nice if the markings were in LBS and not KG

Really trains grip

My legs have gotten ahead of my grip strength. I can barely hold onto 300+ lbs when dead lifting. So I needed to increase my grip strength. I looked at those old school ones you see in movies where the head exec is squeezing one while yelling on the phone and chewing gum. But then I realized, once my strength improved, I would have to buy a new one. That's when I started to look for an adjustable grip trainer and landed on this one. It has been exactly what I needed.

I sit at my desk reading e-mails or watching videos, I try to get each arm to 100 reps as fast as possible. Once it becomes easy, I adjust the tension by spinning the cap on the front. This thing has insane tension, it's no joke. I can't even come close to the max weight at this time. The other cool feature is the grip adjustment. As your increase the tension, it moves the grip around, so you spin the metal wheel and adjust the grip to exactly where you need it. It's a very well thought out design. It's a very sturdy build, and I have a feeling this is going to be on my desk for years. I am hoping one day to get to the max level for 10 reps in a row with each arm.

p.s. As an added bonus, this increases my handshake game in the business world. People have noticed.