1Clear Mark: Transparent design allows for easy viewing of the axle of motion and range of motion of the joint, and you can place the device directly on the joint or limb for easy viewing. 2Widely Used: Finger goniometer can be used to measure joint range of motion, spine angle, etc. Can also be applied to the production of architectural drawings and level measurement. 3180 Degree: Goniometers offer 180 degrees of coverage in and can be applied on various scenes with 180 degree rotation, various scales can offer a variety of readings. 4Portable Desgin: Small in size, light in weight and portable, it is an ideal choice for assisting physical therapy and a necessary practical tool at home. 5Hard Material: Finger goniometer made of excellent plastic material, which is tough, sturdy and designed with transparent colors, can be used for a long time.