The StudSensor HD55 deep-scanning stud finder features an enhanced LCD display, with Target Spotlight, that illuminates on-screen when you've found the edge of a stud. Select from 2 stud scan modes to find the edges of wood and metal studs to securely anchor mirrors, shelves, and cabinets to the wall while also avoiding live AC electrical wiring.. Locates the edges of wood or metal studs. DeepScan mode doubles the scanning depth. WireWarning detection. StudScan mode locates the edges of wood or metal studs up to 3/4 in. (19 mm) D. WireWarning detection indicates the presence of live, unshielded AC electrical wiring up to 2 in. (51 mm) D. Zircon recommends the use of a brand new 9-Volt battery (sold separately), check the battery expiration date upon battery installation and replace battery periodically due to the LCD power requirements. 1387 1150 4 28