The Optical Digital Pupilometer is designed for high-accuracy PD measurement, ensuring accurate distances between pupils during eye examinations and fitting procedures. The PD Meter utilizes direct point sampling for reliable results. This Pupil Distance Meter offers an automatic shutdown feature that activates after 1 minute of inactivity, preventing unnecessary battery drain. It also includes a memory function to recall the last measurement when turned back on. Equipped with a low-power design and adjustable LED brightness, this Optical Digital Pupillary Distance Meter enhances battery life while providing clear visibility, ensuring optimal use in lighting conditions. +2.00D visual compensation included. With the upgraded Knob, our PD Measurement Tool allows users to easily switch between multiple viewing distances ranging from 30cm to (∞), accommodating needs for both patients and opticians. This Optical Digital Pupilometer conveniently measures both eyes independently. Simply align the pupils with the white line and the button for accurate measurements, making it an essential tool for optometrists and eyewear retailers. Optical Digital Pupillary Distance Meter PD measuring range: 45~82mm Left or right pupil distance: 22.5~41mm Distance of target:30cm~∞ Power supply: Voltage: DC 3V Specification: AA battery x 2 Power: 5W Package size: 221 x 164 x 3mm Net weight: 0.66kg Indication Error: ≤0.5mm Asymmetry Error: ≤0.5mm Rounding Error: ≤0.5mm Color: As Shown Material: plastic Package Contents: 1 pcs * pupillary distance measurement tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.