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A triangular scale is a type of ruler with a triangular cross-section, often used in technical drawing and engineering. It has multiple scales, each representing different units of measurement or a specific ratio, such as architectural or engineering scales. The triangular shape makes it easier to read measurements from different sides of the scale, and it is often used to accurately measure or draw to scale on blueprints, plans, or diagrams. Triangular scales are commonly used by architects, engineers, and designers for precise and scaled drawings.

A triangle is a tool with three straight sides and three angles, commonly used for drawing or measuring angles and straight lines accurately. These instruments, also known as set squares or drafting triangles, are often made of plastic or metal and are typically used in technical drawing, architecture, and engineering. The angles of the triangle are marked, allowing for precise measurements of right angles or other specific angles. Triangles are essential for tasks that require accurate alignment and angle construction.

A flexible ruler is a measuring tool made from a bendable material, such as plastic, rubber, or fabric, allowing it to curve around objects or follow uneven surfaces. It is typically marked with units of measurement, like inches or centimeters, and is used for tasks that require flexibility, such as measuring curved or irregular shapes. Flexible rulers are commonly used in tailoring, crafting, and design work, where precision in measuring round or curved surfaces is needed. Their ability to conform to shapes makes them useful for a wide range of creative and practical applications.

A folding ruler is a measuring tool made of several hinged segments that can be extended or folded for easy storage and portability. It is typically marked with units of measurement, such as inches or centimeters, and is often made from wood, plastic, or metal. The folding ruler is commonly used in carpentry, construction, and other trades to measure distances, lengths, or to mark straight lines. Its compact design allows it to be carried in a pocket or tool belt, making it convenient for on-the-go measurements and quick tasks.

A digital ruler is a measuring tool that displays measurements on a digital screen, rather than using traditional markings. It typically has a built-in sensor or encoder that detects the position of the ruler's edge and converts this information into digital format. Digital rulers can measure in units like inches or centimeters and offer features such as precise measurements, the ability to switch between units, and memory for storing previous readings. These rulers are commonly used in fields like engineering, design, and electronics, where accurate measurements are crucial and ease of reading is important.

A laser ruler is a digital measuring tool that uses a laser beam to measure distances accurately. The device works by emitting a laser that reflects off a surface, and the time it takes for the laser to return is used to calculate the distance. Laser rulers typically display the measurement on a digital screen, making them convenient for measuring long distances or hard-to-reach areas. They are commonly used in construction, interior design, and real estate for tasks like measuring room dimensions or distances between objects, offering greater precision and efficiency compared to traditional tape measures.

A grid ruler is a measuring tool that features a grid pattern on its surface, allowing users to measure and draw with precision. The grid is typically made up of evenly spaced lines, often in squares or other regular patterns, which can help with tasks like aligning or positioning objects, drawing straight lines, or measuring distances between points. Grid rulers are often used in drafting, design, architecture, and artwork, as they provide a visual reference that makes it easier to create accurate and proportional drawings or measurements.

A caliper is a tool used to measure the distance between two opposite sides of an object with high accuracy. It has two arms, one of which is fixed, while the other can be moved to fit the object being measured. Calipers can measure internal and external dimensions, as well as depths. They are commonly used in fields like engineering, metalworking, and woodworking to ensure precise measurements of small parts or components. Calipers can be found in various forms, including manual, dial, and digital versions, each offering different ways to display the measurement.

A lettering guide is a tool used to help create consistent and neat lettering, typically for drawing or writing. It consists of a ruler or template with evenly spaced lines, grids, or guides that assist in maintaining uniform size, spacing, and alignment of letters. Lettering guides are commonly used in calligraphy, graphic design, and drafting, where precise and clear lettering is important. They help ensure that text appears neat and professional, making them useful for both artistic and technical writing tasks.

A compass is a tool used for drawing circles or arcs and measuring distances on maps. It consists of two arms, one with a pointed end for placing on a surface and the other with a pencil or marker for drawing. The distance between the points can be adjusted to create circles of different sizes. Compasses are commonly used in geometry, drafting, and design for precise measurements and drawings. They are also used by surveyors and mapmakers to measure distances on maps by adjusting the compass arms to the scale of the map.

A beam compass is a tool used for drawing large circles or arcs. It consists of a long beam, with one end having a pencil or marker and the other end having a point or pin. The distance between the two ends is adjustable, allowing for the creation of circles with varying sizes. The beam compass is often used in engineering, architecture, and art, where precision and large-scale circular designs are needed. Its design makes it ideal for drawing large, accurate circles that would be difficult to achieve with a standard compass.