When a rough estimate isn't enough and you use your smartphone as a calculator, but receive a call in the middle of a conversation, investing in the Casio pocket/desktop calculator is worthwhile. This easy-to-use little helper reliably ensures that fewer mistakes are made. The model displays up to twelve digits and impresses with its clarity. With the help of the tiltable display, you can easily read the entered numbers. The model is powered by a clever combination of solar and battery, allowing the calculator to be used conveniently anywhere. It requires an LR44 battery, which is conveniently included, so you can start calculating right after unpacking.