Duka Atuman Laser Angle Casting Instrument Real time Angle Meter LI 1 with Double-sided High-definition LED Screen Due to product upgrades, Single Laser Version Measurement Data is more stable, Recommend to order the single laser version. There are two version in link,one is Dual laser version,one is Single laser version,when you place an order,please choose right version, Thanks. Before order Please Note:It is Youpin Ecological Chain Products [There is no any Youpin LOGO on it]Thanks for your understanding! Product Parameters Name : DUKA Ll1 laser angle projector Product Size : 120*20*35mm Product net weight : 95g Laser wavelength : 660nm Laser cla : Cla ll Protection level : IP54 Indoor distance : 10m Accuracy : 0.5 Battery : 730mAh Rechargeable Lithium Battery Operating mode : Absolute angle + Relative angle