Takes over where an ordinary compass leaves off and eliminates the need for numerous beam compasses. Use to:

• Determine the radii of existing curves for dimensioning drawings
• Find centerlines and center points of curves
• Determine what radius a curve must be to fair in existing points or lines on drawings
• Make last-minute changes to computer-prepared drawings

The 12" ruling edge is easily adjusted for drawing curves of any radius from 6-3/4" to 200" (17cm to 500cm).

Note: Keep the ACU-ARC away from direct sunlight.