The Raniaco Hand Grip Strengthener is a great adjustable entry-level fitness appliance for strengthening your grip.
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Pro Adjustable resistance
You can adjust the resistance by turning the red button near the bottom end of the spring. The grip strengthener is adjustable from 22 lbs to 88 lbs.
Pro Very affordable
These are great entry-level grip strengtheners for just $10.99. There are options that cost several times this much.
Pro Simple anti-slip rubber handle
The rubber handle makes sure the grip strengthener does not slip out of your hand. The handle grip is rather flat with no finger nubs - so you can easily switch the grip techniques and change the amount of fingers you use.
Con Spring might break
The spring that creates the resistance can break after a few months of use.
Con Not an option for advanced weight-lifters
Since this grip strengthener is adjustable only up to 88 lbs, then it works as an entry-level pick. More advanced weight-lifters will find themselves doing too many reps even with the maximum resistance.