Alvin 270PX Scale Mech Drftsmn Plas 12 Reviewhttp://tinyurl.com/ndaclcj Alvin 270PX Scale Mech Drftsmn Plas 12 Impact plasticWith left to right reading calibrations.Graduations: 1/8, 1/4, 1/2, 1 to the foot; 1/4, 3/8, 1/2, 3/4 size; 50ths and 16ths.Supplied in plastic sleeve.Hot foil-stamped graduations and color-coded furrows.