Package information: You will receive 4 goniometers in the package, featuring both inch and centimeter scales. The transparent design allows for easy and quick reading without visual obstruction, facilitating efficient use. Double scales: Two rulers are integrated into one body with dual scales and 7-inch (18 cm) long arms, extendable up to 14 inches (36 cm), making it ideal for various drawing and design applications. A practical tool for everyday measurement and drafting needs. 360-degree rotation: The goniometer provides full 360-degree rotation, suitable for multiple applications, aiding in the accurate assessment of joint range of motion in physical therapy, sports medicine, and related fields. Wide applications: This 360-degree goniometer can measure joint movement angles such as those in the elbows, knees, and spine. It is also useful for architectural drawings and general angle measurements. Ideal for artists, builders, designers, carpenters, architects, teachers, engineers, students, and others involved in technical drawing or measurement tasks, offering convenience and reliability. Material: PVC Color: As shown Package Contents: 4 pcs goniometer Note: Light and display settings may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3 cm.