Inside a hand grip strength tester - dynamometer.

This is a device that tests your grip strength and logs the peak reading in either pounds of kilograms. It's used in the fitness and medical industries. The construction is actually better than I was expecting. Very robust. The keywords for an eBay search are digital hand dynamometer. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- http://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.