The Zircon StudSensor 70 center finding electronic wall scanner comes loaded with the latest technology in density detecting software and circuitry. Using the patented CenterVision technology, the SS 70 easily locates the center and edges of wood and metal studs and joists behind walls, floors, and in ceilings with just one pass. The specialized SpotLite Pointing System and an audio tone indicate the location of the target. In StudScan mode, the SS70 locates the center and edges of shallower wood or metal studs up to 3/4 of an inch (19 mm) deep. Switch over to DeepScan mode by quickly pressing the Power Button twice to double the scanning depth to 1.5 inches (38 mm). The StudSensor 70 is programmed with a WireWarning Detection feature that indicates the presence of live unshielded electrical wires up to 2 inches (50 mm) deep when using both stud scan modes. The SS 70 also comes equipped with a built-in erasable marker enabling you to mark the hazards or studs with the simple push of a button. To get started, install one brand new 9V alkaline battery (not included). Place the unit flat against the wall and calibrate it. Once you hear the calibration beep and see the “Ready” LED light, continue to hold the Power Button and slowly slide the tool across the surface. As the stud detector approaches the edge of a stud, the red LEDs progressively light from the bottom up in both scanning modes. The top lighted “Center” LED, SpotLite Pointing System, and audio tone all indicate when the stud’s center is found. Make sure to note whether the WireWarning Detection is alerting to live, unshielded AC wiring before drilling between the two marks into the center of the stud. Now delivered to you in our Amazon exclusive easy to open packaging with no clam shells and no twist ties, the SS 70 is ready for use just seconds after you receive it. With the Zircon StudSensor 70, you can safely maneuver through the most complicated of projects with the professional confidence that comes from owning a Zircon.