Scientific calculator
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A scientific calculator is an electronic calculator, either desktop or handheld, designed to perform calculations using basic and complex mathematical operations and functions. They have completely replaced slide rules as well as books of mathematical tables and are used in both educational and professional settings.
Casio fx-991DE X - A modern Digital calculator from Casio with a dot matrix "Natural Textbook" LCD
Casio fx-77, a solar-powered digital calculator from the 1980s using a single-line LCD
HP-35, the world's first scientific pocket calculator, was introduced in 1972 by Hewlett-Packard. It used reverse Polish notation and an LED display.
TI SR-50
Calculator
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An electronic calculator is typically a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics.
An electronic pocket calculator with a seven-segment liquid-crystal display (LCD) that can perform arithmetic operations
Scientific calculator displays of fractions and decimal equivalents
The interior of a Casio FX-991s calculator
An office calculating machine with a paper printer