Mr. Pen Mechanical Switch Calculator - 12 Digit Large LCD Display, Pink with Big Buttons

A function that automatically calculates the tax amount and total price by simply entering the pre-tax price and tax rate. Useful for quick calculations when shopping or managing household finances. Simplifies calculating consumption tax when comparing prices.

A function to store numerical values and reuse them in subsequent calculations. It stores intermediate calculation results or frequently used numbers. Simplifies complex calculations that involve reusing the same numbers repeatedly.

A function to calculate the square root of a number. Useful for calculations in DIY projects or schoolwork where square roots are required. Eliminates the need to manually calculate square roots or use external tools.

A function to easily calculate percentages such as discounts or profit margins. Useful when shopping or analyzing sales data. Avoids the need for complex manual calculations.

A function to quickly switch the sign of a number from positive to negative or vice versa. Useful for calculations involving debits and credits or temperature changes. Simplifies correcting entry errors or performing calculations with both positive and negative numbers.

A function to specify the number of decimal places displayed in the calculation result. It allows to round off results or display up to a specified number of decimal places. Useful when you want to avoid displaying unnecessary digits.