The edge finder is mainly used to determine the X and Y zero offset values of the of the workpiece coordinate system in the machine tool coordinate system, and can also measure the simple dimensions of some workpieces. Commonly used in milling machines, end beds, and other mechanical equipment. Net weight:about 168 grams Battery:2 x 1.5v special battery for photoelectric edge finder(with battery) Note:The appearance of the product be slightly different due to different factory batches, which not affect the use, subject to the receipt of the physical object! Colour:As Shown Material:stainless steel Package Contents: 1 * Photoelectric edge finder 2 * Battery 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.