Calculators have come a long way over the years. Most of are used to digital calculators now but mechanical calculators used to be a thing a couple of decades ago. Take the Swift Handy Calculator for instance: a nifty mechanical calculator that lets you add numbers faster. It comes with a tiny stylus to move the numbers.
More gadgets like this: here
Swift Handy Mechanical Calculator 🧮 Gadgetify
This mechanical calculator is not that expensive and makes a nice gift to math students and geeks. The above video shows it in action.
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