The Plug Mark is an accessory to the Blind Mark XT Kit and requires a Blind Mark Locator to be used. The Plug Mark
is designed to be used when electrical receptacles have already been install prior to the drywall or paneling being installed. The Plug Mark Kit comes with 2 Plug Marks.
Check out The 5 Easy Steps to use the Plug Mark Target
Check out the Plug Mark Demonstration