The ACU-ARC Adjustable Ruler is an ingenious tool that eliminates the need for a beam compass or expensive curve sets. Use the ACU-ARC Adjustable Ruler to draw large curves or arcs in just seconds with improved accuracy, to determine radii of existing curve, to find center lines and center points on drawings, or to determine what a curve must be to fair in existing points or lines on a drawing, or to make last minute changes to computer prepared drawings.
Why buy a set of rigid curves when one instrument will do the job better. Made of a new plastic material that will not break with normal use. The ACU-ARC Adjustable Ruler is available in either standard (inch) or metric (centimeter) versions. Adjusting to give you the ability to draw curves or measure radii from 7" to 200" or 17cm to 500 cm. Replacement blade for the ACU-ARC Adjustable Ruler is also available.