Accuracy 0.005MM; Quickly locate work edges; Probe hardened and precision ground; No rotation required during measurement; LED lights up and beeps when probe contacts conductive workpiece; Features a safety spring puller that returns the ball precisely to position if dislodged; Quickly locates work edges and saves time when setting up on milling machines, jig borers, and similar equipment; Equipped with a highly sensitive location sensor, red pilot light for clear visibility, and ble beeper; Capable of detecting end surfaces, outside and inside circle diameters; Shank diameter: approximately 20mm; Item length: approximately 160mm; Ball diameter: approximately 10mm; Requires 2 x LR1/1.5V/N alkaline batteries (size N/LR1/1.5V), not included; Color: silver; Material: steel; Package includes: 1 x electronic edge finder with original box; Other items not included; Note: Lighting and display differences may cause slight variation in color appearance; Measurement tolerance: +/- 1-3cm.