Cutting comb same design as YS-320 with laser printing of the scale on a ruler that can measure the length of hair from either side, particularly the essential value of 10 cm at the exam for academy students in Japan. The concave tops of the comb enable you to measure an angle of 90 degrees fitting the shape of the head. The concave teeth for great grip to create finger wave. The laser printing of the scale on a ruler will not come off.