Zircon Stud Finder, Series: StudSensor HD35, 2.38 in Overall Width, 6.07 in Overall Height, 2 in, Splash and Water Resistant, For Wood/Metal/WiringLocates the edges of wood or metal studs up-to 3/4 in (19 mm) deepReady light indicates when calibration is complete and tool is ready for useEdge arrow lights up sequentially as you approach a stud and fully illuminates when you have found the stud edgeZircon’s patented over-the-stud indication alerts you to start the scan in a new location as scanning began over a studWire warning detection indicates the presence of live, unshielded ac electrical wiring up-to 2 in. (51 mm) deepSpotlite pointer shines an arrow-shaped light on-the wall to clearly indicate the edge of the studTranslucent base and illuminated v-marker groove for more accurate marking of stud edge location9-v alkaline battery type20 – 120 deg F operating temperature, -20 to 150 deg F storage temperature, 80% RH (non-condensing) humidity