straight ruler

This is a ruler used for measuring length or drawing straight lines. It's a basic stationery item used in schools and offices.

They are usually 30cm or 15cm long and have both centimeter (cm) and inch markings. Most rulers are made of transparent plastic.

A ruler is considered a symbol of accuracy and precision. It's an essential tool in mathematics, science, and design, playing a particularly crucial role in the work of architects and designers.

Even in the digital age, the function of a ruler remains important. CAD and graphic design programs include ruler tools as essential features. Physical and digital rulers each have their own advantages and disadvantages, and are used accordingly depending on the situation.