Tri-Fold scales can be configured in three different modes: straight, right angle and dual right angle The EFR300 measures units in centimeters and is 90cm long when fully extended, 30cm x 60cm as a right angle and 30cm x 30 cm as a dual right angle Scales are manufactured of 040-thick yellow polystyrene 1-1/2 wide) with black divisions and are printed on both sides to permit horizontal or vertical measurements with a 1/4 hole for hanging if required