Dasqua 12" master precision level is used to measure the straightness and flatness of machine guide rails. Strictly made in accordance with DIN877. Robust cast iron model with a precision ground measuring surface ensures high accuracy. V-grooved base allows for use on round bars, shafts and cylindrical surfaces. Includes a main vial and a cross test vial. High-sensitivity bubble with 0.005" graduation. Accuracy is 0.0005" Per 10".