Features:These electronic edge finders quickly locate work edges and save time when finding positions on milling machines, jig borers etc. They employ a highly sensitive location sensor and utilise a red pilots light which can be clearly seen. The location of the end surface, outside & inside circle diameters can be detected. They operate by completing an elecrical circuit through the machine and light up when the sensor is in contact with the workpiece. The ball sensor is spring loaded to prevent accidental damage by overun. 100% new brand and high quality.Notice:Actual color may be slightly different from the image due to different monitor and light effectPlease allow 1-3cm deviation due to manual measurementDescription:Overall Length:160MM Shank Diameter: 20MM Probe Diameter: 10MM Accuracy: 0.005MM Battery: LR1 1.5V (without battery)includes:1x Edge Finder