• One side of the 36” base arm is etched with a 0”- 36” ruler graduated in 1/16”

of an inch and the other side is etched with a 0”- 36” ruler graduated in 1/8” of an inch.

• One side of the 48” base arm is etched with a 0”- 48” ruler graduated in 1/16” of an inch and the other side is etched with a 0”- 48” ruler graduated in 1/8” of an inch.

• The protractor heads have double graduations from 0 L - 180 L in opposite directions.

• Made of Aluminum

• Accuracy: (+/- 1 degree)