The Pupillometer is designed to measure the interpupillary distance (IPD) during eyeglass refraction. It features direct point sampling and high positioning accuracy. Delivers a measurement error of less than 0.5mm, ensuring highly reliable results. The PD Meter can be turned on/off with a single press of the power button. It automatically powers off after use to conserve battery life while retaining settings. The system eliminates parallax errors. Equipped with a stainless steel forehead rest and soft rubber nose pads for comfort and precision during measurements. Features a clear digital display for instant readability. Directly measures distance PD, and pressing the PD key calculates near PD automatically. Color:As Shown Material:Metal Package Contents: 1 * 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.