Angles of main unit are 45°･60°･120°･135°, so this can be used as Angle Scribing Square. (A stop ruler is a convenient tool when making alignment of 45°or scribing lines in construction work)A measurement of 0-90°from side to side can be made.There is the scale of 25cm (9.84 in).● Polycarbonate resin ● Dial type angle slant meter● With a Scale ● With rubber magnet● 4-line acrylic horizontal vial with lens● 4-line acrylic vial(Horizontal vial)Sensitivity 0.50mm/m=0.0286°Precision ±1.5mm/m=within±0.0859°(Vertical vial)Sensitivity 0.50mm/m=0.0286°Precision ±34.9mm/m=within±2.0°