Features: Achieve precise measurements of pupillary distance and height with this high accuracy vernier caliper tool, minimizing errors for perfect eyewears fitting in optically shops. Crafted from lightweight plastic, its ergonomic grip and clear two scale markings ensures fatigue less operations and fast data reading during prolonged use. Ideal for professional opticians requiring frequent measurements and home users seeking reliabled auto check solution for preliminary visibility adjustments. Perfectly suited for eyewears fitting stations in optically stores or visibility care routines, combining clinical grade accuracy with everyday practicality. This multifunctional optically vernier caliper bridges professional and household needs, featuring anti slip ridges and distortion resistant construction for consistent performances across repeated uses. Specifications: Component: plastic Size: Approx.21x5.4cm/8.26x2.12inch Color:white Technical parameters: Accurate measurement of pupil distance and pupil height, vernier caliper design, easy to read scales Package Includes: 1pcs Pupil Distance Measuring Tool note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.