Metal Pupil Distance (pd) Ruler

This pupil distance ruler is about 17.5*2.3cm. 0-150mm ruler, measuring range 0-80mm. 20mm~40mm on each side, good position, perfect match with the nose, making PD measurement easy and accurate, single or double pupil distance can be easily obtained with a ruler, you can measure it at home or at home Measured with the help of a friend.