Features: Photoelectric edge finder features: It can be measured without turning Suitable for the traditional milling machine and comprehensive processing machine. The X and Y axes of the workpiece can be measured and set. When the probe comes into contact with the workpiece, a red light and a sound will appear. Not easy to wear,higher precision,stable performance,durable. Specification: Name: edge finder Process: uncoated Large end: 20mm / 0.8in Small end:10mm / 0.4in Total length:160mm / 6.3in Battery: 3* LR1(not included) Usage: make the spindle stop and control the probe to approach the working face slowly. When the probe comes into contact with the working face, the LED indicator lights up and gives a prompt sound. At this time, the distance between the spindle center and the working plane is 5MM. Package list: 1 x Edge Finder(battery not included) 1 x box Note: To ensure the measurement accuracy, do not directly touch the probe with your hands If not used for a long time, please remove the battery to extend the battery life. If the battery power is insufficient, please replace the same type of battery immediately. This edge finder is an electronic product. It should avoid short circuit or corrosion caused by cutting fluid entering inside.