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.

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• #science_technology
• #hand
• #grip
• #strength
• #tester
• #dynamometer
• #digital
• #test
• #force
• #muscle
• #camry
• #eh101