This is the third strength trainer I have bought and is by far the best one yet. The handles and spring are smooth and sturdy with an even motion.The dial to adjust resistance is easy to turn and is very accurate. I no longer use the others and this is used daily to maintain grip strength after a hand injury.
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https://www.amazon.com/gp/product/B01IVMD9XI/ref=oh_aui_search_detailpage?ie=UTF8&psc=1