Working Principle: This laser auto focus sensor precisely adjusts focal length by monitoring the automatic rise and fall of the Z-axis in real time, ensuring consistent focus during engraving and cutting. It greatly improves accuracy, reduces manual adjustment time, and helps achieve cleaner edges and more detailed patterns. Optimized Size: Overall length is 103mm, with a standard 25mm hole diameter designed to fit common CO2 laser engraving heads. The included extension line is ≥1.25m, providing ample length for flexible routing in most machine cabinets, improving installation convenience and ensuring stable signal transmission. Connection Method: Simply connect the auto focus sensor extension cable to the Z-axis control board to enable automatic focus control. The focusing sensor must be used together with an automatic up-and-down lifting table and a laser head, allowing the machine to automatically adjust height for different material thicknesses. Wide Application: Equipped with a 25mm diameter ring connector, this sensor is compatible with most mainstream CO2 laser engraving heads on the market. It is suitable for a variety of CO2 laser engraving and cutting machines used for wood, acrylic, leather, rubber, and other materials, making it ideal for workshops, studios, and small factories. Package Includes: The kit contains 1 x laser auto focus sensor only, without laser head or focusing lens, allowing you to pair it with your existing CO2 laser system. This design makes it a cost-effective upgrade option, enabling you to enhance auto-focusing performance while retaining your current laser head and optical components. Color: Red Material: Metal Package Contents: 1* laser auto focus sensor 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.