SHINWA Protractor with halfround base and two blades
Two blades extend measuring possibilities, see picture left below.
Measuring range 0 - 180°, with locking screw, steel body/base chrome plated essentially glare-free, blades stainless steel, graduation deeply edged.
Size of bow: D = 89 mm
Length of blade 150 mm
Length of graduation on blade 100 mm