A C-Thru Ruler typically refers to a type of transparent ruler, often made of plastic, that allows for clear visibility of the surface underneath it while making measurements. The name "C-Thru" suggests its see-through design, which is especially useful for precise alignment over drawings, graphs, or text. These rulers are commonly used in classrooms, design settings, engineering, and art because they help users take accurate measurements while maintaining a clear view of what they are working on.
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