Solar-powered calculator? That’s soo 90’s. It’s time for the new era, a WATER-powered calculator. Yes, you heard it, a water-powered CL-168 calculator from ABBA. This compact, lightweight handy calculating device doesn’t need battery, fuel, or sun light. Only water. I bet it’s waterproof as well, making it possible to calculate your tax while relaxing in the bath tub. Moreover, along with its ergonomic design, the calculator also adopts a 8-digit display.