HP-18C
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The HP-18C is a Hewlett-Packard business calculator which was quickly followed by the very similar but greatly improved HP-19B. The HP-18C is HP's first RPL-based calculator internally, even though th
An HP-18C in the state used for operating it. When not in use or for transport, it can be folded together due to its clamshell design, so that its width becomes half of what it is in the image.
Calculator
Videos
A 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
A modern scientific calculator with a dot-matrix display
Scientific calculator displays of fractions and decimal equivalents
The interior of a Casio FX-991s calculator