CASIO MS-10F 10 Digit Desk Calculator with, Tax, Currency Reliable & Durable CASIO Desktop Calculator with Anti-slip Rubber Feet. • Solar/Battery powered - solar powered when light is sufficient, else battery powered, with Auto Power-Off. • 10 Digit angled XL-Display (ca. 7.9 x 2.3 cm) with function command signs and thousands separators, 1.8 cm high digits. • Easy to operate and ergonomically shaped non-stick plastic keys. • Numeric keypad configured with "0" key below "1" key. • Advanced Percentage Calculation - enabled by CASIO's unique input logic, showing absolute value of the % before adding to the base. • Tax Calculation of price plus tax / price less tax, display of tax amount and gross amount, tax rate storable. • Currency Conversion with 2 storable rates. • Mark-Up Calculation via % key - calculating the sales price resulting from a chosen profit % demand. • Constant Calculation. • Summarizing 3-key Memory. • +/- key for algebraic sign change. • Key Rollover - Input Buffer Memory, enables very fast input typing.