Notes: Due to manual measurement, the size and weight may have a certain error. Due to the difference between different monitors, there may be a slight color difference existed. Package Content: The package contains a pair of clear protractor goniometers, which is sufficient to meet all your needs. Special Design: The head of our protractor angle finder can rotate 180 degrees around the scale, and it has an extendable arm that can go from about 7 inches to about 12 inches in length. Easy to Use: With a transparent color and double-scale design on the measuring arm, this clear plastic goniometer allows for quick and easy reading of measurements. Premium Material: Made of durable plastic, the protractor ruler features a clear scale that ensures long-lasting use as it is not prone to breaking or deforming easily. Wide Applications: This angle measuring tool is suitable for a variety of professions and hobbies, including artists, designers, architects, construction workers, carpenters, teachers, engineers, students, and anyone who needs to make accurate measurements.