V-groove on bottom for shafts (shafts dia. 15~70mm) With transverse vial Supplied with adjusting wrench Code Length (L) Sensitivity B C 4903-150A 150mm 0.02mm/m(=0.001°) 40 45 4903-200A 200mm 0.02mm/m(=0.001°) 42 47 4903-150A 300mm 0.02mm/m(=0.001°) 45 50 Check the PDF