[. . . ] Twice to clear any residual values and calculation instructions in the calculator. [. . . ] â· Since this product is not waterproof, do not use it or store it where fluids, for example water, can splash onto it. This product, including accessories, may change due to upgrading without prior notice. SHARP will not be liable nor responsible for any incidental or consequential economic or property damage caused by misuse and/or malfunctions of this product and its peripherals, unless such liability is acknowledged by law. To perform a tax calculation, first it is absolutely necessary to set and check the tax rate. [. . . ] However, the conversion rate may change because of battery replacement or consumption, etc. [. . . ]