This wood ruler design is slightly thicker than most plastic rulers. The black markings for measurements are precise and easy to read on the light wood ruler surfaces. One edge of the ruler has marked divisions for measuring surfaces in inches, and the other edge shows markings for measuring in centimeters. This eight-inch wood ruler is sturdy and will last for long-term daily use in your office, classroom or home study area. Plastic rulers can be washed with soap and water if food or beverages are spilled on them while in use. They are easy to pack in the slim side pouches of book bags or backpacks, and they fit easily into slender desk drawers and storage cubbies. Plastic rulers are very lightweight yet durable. The yellow plastic is opaque to avoid confusion in reading ruler markings caused by the colors or textures of surfaces being measured that can be visible through transparent rulers. While one is designed to show measurements in centimeters, the other has markings for measuring in inches. These two yellow plastic rulers show the two methods of linear measurement today. This size ruler is also useful for hand-drawing charts, simple graphs and tables in study and office notes. It also fits easily into the pockets of laptop carrying bags and cases. Lightweight yet durable, this ruler is also easy to carry in a backpack or briefcase as needed. Whether the user needs to measure a shipping box or check the dimensions of drawings for a poster, this style ruler is a perfect choice. Displayed here beside a long-lined writing pad, a pen, pencil and eraser, this typical desk ruler aids both workers and students in completing many everyday tasks. This white 12-inch desk ruler with beige edges is easy to read and convenient for use on office and classroom desks. Twenty-one varieties of rulers that are in common use today and serving different purposes include the following: Desk Ruler Modern rulers are available in all the colors and shades of the rainbow and in a wide array of materials, including wood, plastic, rubber, aluminum, stainless steel and others. Although the introduction of the flexible measuring tape reduced the popularity of hard rulers, these sturdy measuring tools are still frequently used by many designers, carpenter and handymen today. These rulers could extend to lengths of six feet or more while folding back up to a convenient carrying size when not in use. In 1851, Anton Ullrich, a German industrialist, invented the folding rule, which was formed by a series of six-inch rulers connected by pivoting hinges. Throughout their history, rulers of varied sizes and shapes have been produced from wood, ivory, copper and other metals. These simple yet essential tools have since been used for measuring dimensions, drawing lines and serving as a guide for cutting materials. Wooden measuring tools are reported to have been used as early as 2650 B.C.
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