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"Features: The excellent tools quickly locate work edges and save time when finding positions on milling machines, fixture, etc. With a safety spring puller which puts the ball precisely back to the position when ball breaks away from ball seat With a highly sensitive location sensor, a red pilot light and a beeper, can detect the location of the end surface, outside & inside circle diameters. LED lights up and it beeps instantly when probe touches conductive work piece. Probe hardened & precision ground. Specifications: Material: high speed steel(HSS) Precision: ±0.005mm Shank Diameter: about 16mm Item length: about 160mm Ball Diameter: about 10mm Battery: 1 x 23A/12V alkaline battery Package includes: 1 x Optical edge finder 1 x 12V/23A alkaline battery"