Precision level
8 Long, 0.0001 Graduation Sensitivity per 10, 2 Vials, Square Inspection Block LevelCast Iron, 0.0001 Base Flatness, 1-9/16 Wide x 8 HighInspection square block levels are designed for inspecting horizontal, vertical and cylindrical surfaces. They are heat insulated and have four bases, two flat and two grooved.