handtensioner
A handtensioner is a type of tool or device designed to provide resistance or tension for the hand and finger muscles. These devices are commonly used in physical therapy, occupational therapy, and for hand strengthening exercises. They can also be found in the practice of musicians, athletes, and individuals seeking to improve grip strength and dexterity.
The design of handtensioners varies widely. Some are simple elastic bands or rubber grips that require squeezing.