Something worth looking into. I'm thinking of ordering one myself.
The BowPlane uses the latest in laser technology to project a laser line 360 degrees all the way around your bow, creating a visible reference plane to adjust not only your rest, but also your cams and sights at the same time. This patented and patent pending laser technology is soon to emerge in other industries but thanks to DoubleTake Archery, the archery industry will see it first.
The BowPlane is a short 11" setup arrow that nocks on your string just like a normal arrow. When you activate the laser plane, it project a laser line 360 degrees around the inside of your bow--up and down your bowstring, along your cams and/or idler wheels, upper and lower limbs, riser, handle, rest and sight pins. It is complete bow alignment all in one easy step.
http://www.doubletakearchery.com/bowplane/index.htm