Grippers, sometimes called hand grippers, are primarily used for testing and increasing the strength of the hands; this specific form of grip strength has been called crushing grip, which has been defined as meaning the prime movers are the four fingers, rather than the thumb. There are differences from brand to brand, but the common feature of standard grippers is that they use a torsion spring fitted with two handles.
Grippers, sometimes called hand grippers, are primarily used for testing and increasing the strength of the hands; this specific form of grip strength has been called crushing grip, which has been defined as meaning the prime movers are the four fingers, rather than the thumb. There are differences from brand to brand, but the common feature of standard grippers is that they use a torsion spring fitted with two handles.
Source: Wikipedia "Grippers" · CC BY-SA 4.0
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