Blind Mark Drywall Cutout Tool

Here's a very cool tool that promises to eliminate the need for accurate measurements when making cutouts in drywall or panelling for electrical outlets and wall switches. The device comes in two pieces. The first piece is called the target, and is placed into the outlet or switch box. The second piece, called the target locator is attracted to the first piece thanks to two strong magnets that ensure perfect alignment and accuracy. Once the locator affixes itself to the target, the installer simply outlines the box and makes the cut with a dremel or whatnot. Very clever. Ah, why try to visualize it - view the demo videos here.

Amazon.com page - unfortunately they are currently unavailable.

Manufacturer's order page.