Robert Baraban Black Adjustable Hand Gripper 50/500lbs Resistance
This hand strengthener is definitely made for the pros with heavy duty parts and major resistance. The entire device is made out of high quality steel which means that it will last long after you have reached the maximum resistance level. As far as resistance goes, it’s going to take you a long time to reach the maximum resistance because it offers resistance between 50 and 500 pounds.
The resistance relies on the position of two springs on the device which is perfect because you do not need to buy replacement springs every time you need to advance a level. The handles are nicely sized and the knurling around the handles offers a nice grip without tearing up your hands with repeated use.