The Calculated Industries 8105 Blind Mark Drywall Electrical Box Locator Tool is a marking gauge designed for precise and efficient marking of electrical boxes in drywall. With its unique features, such as magnets and 3 targets, this tool ensures accurate and consistent results. The durable plastic construction and compact size make it easy to use and carry around for various projects. Designed specifically for professionals in the home and garden improvement sector, this tool from Calculated Industries is a reliable and essential addition to any workshop or job site.