ACU-ARC Rulers:

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 radis 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.

Chiropractors:

The Acu-Arc Adjustable Ruler has been used in your industry for  years. Used for measuring the cervical curve, or monitoring the progress  that is being made with adjustments.  (Please make sure you order the  Metic version of the ACU-ARC Adjustable Ruler.)

The  ACU-ARC Adjustable Ruler is available in either standard (inch) or  metric (cemtimeter) versions. Adjusting to give you the ability to draw  curves or measure radi from 7" to 200" or 17cm to 500cm.