Package information: You receive 4 goniometers in the package, each featuring both inch and centimeter scales. The clear design allows for easy and quick reading, supporting efficient use in various applications. Double scales: Each goniometer combines two rulers in one body with dual measurement scales. The arms are 7 inches (18 cm) long and can be extended up to 14 inches (36 cm), making them ideal for drawing and design tasks. A practical tool for measurement and drafting needs. 360-degree rotation: The angle measuring tool provides full 360-degree rotation, suitable for multiple uses. It helps accurately assess joint range of motion in physical therapy and related fields. Wide applications: This 360-degree goniometer is designed to measure joint movement angles such as those in elbows, knees, and spine. It can also assist in creating architectural drawings and taking horizontal measurements. Ideal for professionals: These transparent plastic goniometers are suitable for artists, builders, designers, carpenters, architects, teachers, engineers, students, and others who require precise measuring tools. They offer convenience and durability for everyday use. Material: PVC Color: As shown Package Contents: 4 x Goniometers Note: Light and display settings may cause slight color variations between the image and actual item. Measurement error allowance: +/- 1-3 cm.