Tri-Fold scales can be configured in three different modes: straight, right angle and dual right angle. The SI-EFR200 measures units in inches and is 36" long when fully extended, 12" x 24" as a right angle and 12" x 12" as a dual right angle. The SI-EFR300 measures units in centimeters and is 90cm long when fully extended, 30cm x 60cm as a right angle and 30cm x 30cm as a dual right angle. Scales are manufactured of 1-1/2" (3.8cm) x 40 mil thick yellow polystyrene with black divisions and are printed on both sides to per mit horizontal or vertical measurements with a 1/4" (6mm) hole for hanging if required.