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Hand calculators, also known as pocket calculators, are small electronic devices used for performing mathematical calculations. They typically have a keypad for inputting numbers and operators, and a display to show the results.

Hand calculators come in various sizes and functionalities, ranging from basic models for simple arithmetic to more advanced scientific calculators that can handle complex mathematical functions like trigonometry, logarithms, and statistics.

While the advent of smartphones and other digital devices has reduced the reliance on physical calculators, hand calculators are still widely used in education, engineering, and other fields where quick calculations are needed.