If you are the eco-friendly type, cheap, or you have built up an enormous amount of wrist strength after years of touching yourself, the Shake-u-lator Calculator is perfect for all of your math-related needs.
The Shake-u-lator uses Faraday’s Principle of Electromagnetic Energy to operate – no batteries or solar panels required. Just give the calculator a quick shake when the power dies out and you’re back in business. And don’t worry, your calculations will not be lost during the process.
Product Page ( £9.99 or $18.58 )
