Manual-Reading Protractor Manual Reading Protractor Range 10 Degrees to 170 Degrees Graduations 1 Degrees Accuracy +/-0.3 Degrees Material Steel Blade Length 23 39/64 in Blade Style Adjustable Operation Type Mechanical Blade Thickness 1.26 in Finish Satin Chrome Head Length 23 5/8 in Head Shape Semi-Circular Includes Clamping Screw Magnetic Head Yes