Tajima OPT-130G Optima Level, 5.1 inches (130 mm),

V-groove measuring surface that can be firmly fixed to pipes. Multiple measurements are possible on the top and bottom of the main unit. Shock absorbing bumpers are attached on both sides. Comes with 2 types of pass-through holes on the left and right. With a powerful neodymium magnet with a magnetic flux density of approximately 13.0 inches (330 mm). As a general measuring level Horizontal Bubble Accuracy: +-0.004 inches (1 m) within (+-0.057°) Comes with 2 types of holes on the left and right sides Shock absorbing bumpers on both sides Multiple measurements are possible for the top and bottom of the main unit V-groove measuring surface that can be firmly fixed to pipes