If it has size options, it could be perfect for me. It is little bit larger than my hand grip.

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.

I like it and use it, but for me as a woman - this thing is too tough. I would like some easier option, where I could practice more.

Nice quality product, great range of resistance.

Best grip exerciser I have ever owned or seen.

I've owned the simple kind with the big spring at the top. They only have one tension and grip length setting. So that's the first plus. This one has adjustable tension and grip length. Other grippers have a single pivot point so most of the hand tension is on the fingers at the bottom of the grip. You can actually lift your index finger during exercise because it's not getting worked as much. This gripper has a scissor action that puts the tension more evenly across all fingers. That's the second big plus. There are lots of other adjustable tension grippers available. But look at the hinge at their pivot point. They all have minimally small pins through the hinge. This looks like the weak point to me or their smaller springs. This gripper has much more robust hinges and springs. That would be the third big plus. I found the handle surface to be a little smooth feeling at first. After using it for a while, my hand strength improved and I have no problem with the grip. The stresses on my fingers made them a little sore and I was wishing for a softer grip, but after a while my fingers toughened and it's also not a problem. Man up. The grip is fine.

I got one without instructions in English. I played with it and got frustrated and almost sent it back. Don't do that. It's not that hard. Here is what you need to know. Tension is the black knob on the front. The silver wheel is the grip width. It's not exactly straightforward because one affects the other somewhat. Start here. Unscrew the front knob until it's not engaging the frame. Then screw it back to just touching the frame. This is minimum tension. It's also how you should store it when you're not using it. The frame will bow if full tension is left on it all the time. (See pics in other reviews.) Now adjust the grip width. Open the grip to full open to take the pressure off the silver wheel. Spin the silver wheel toward the front (towards tension knob) as far as it will go. Then putting your hand on the gripper, figure out how far out you want the grip to open. Hold it there and spin the wheel back to touch your grip length position. Now your tension is at minimum and your grip length is set to your hand. Give it some squeezes. If it is too hard, shorten the grip length. If that's still too hard, this one is not for you. If it's not enough tension, squeeze the gripper to take tension off the tension knob. Then spin the knob in the direction of the arrow. I went one revolution at a time until it was too high and then backed off until it was just right. There is a hole and an arrow on the tension knob so you can count revolutions. If you move the tension very much, it will change the grip length and you will have to readjust that with the silver wheel. Don't forget to open the grip to take the pressure off the wheel to make it easier to move. That's it. Here is a tip. Remember how many revolutions of the tension knob to get to your setting. Always unscrew the tension knob to just touching the frame for storage. Then when you're ready to use it, just spin the tension knob to your setting. Hope this helps you to like your GD 70 gripper as much as I like mine.