The PD ruler for glasses is an essential optometry equipment designed for precise pupillary distance measurement. This aluminum ruler is suitable for opticians and eye care professionals who need to ensure accurate fitting of eyeglasses. With dual-sided scales, it allows for easy and measurement from either side. Simply place the ruler on of the nose, align it with , and read the measurement to determine the correct pupillary distance. Features -Color:White -Material:Aluminum -Size:17.50X2.30X0.03cm/6.88X0.90X0.01in -Essential for optometry: this pd ruler is a must have tool for optometrists, helping them measure pupillary distance accurately for precise lens adjustments - aluminum design: made from aluminum, this ruler is sturdy and resistant to deformation, ensuring accuracy in measurements -Dual-sided scale: features a dual-sided scale with millimeters on one side and inches on the other, catering to various measurement preferences and needs -Compact and portable: the small, rigid design makes it easy to carry and use, providing convenience for both professionals and home users -Versatile application: ideal for optometrists, optical shops, ophthalmologists, and even for home use, making it a versatile tool for all your eye measurement needs Package list: 1 x Pupillary Distance Ruler