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Do not base your order on the picture presented.
Features of the Sammons Preston EZ Read Jamar Plastic Goniometer:
Sammons Preston E-Z Read Jamar goniometers feature transparent plastic with an opaque white background behind degree markings for easy, accurate readings. Inch and centimeter linear measurements. Latex free.
6 3/4" (17cm) Goniometer. Scale reads 0 degrees to 180 degrees in 5 degree increments. Ideal for small joints.