Zircon TriScanner Pro SL Edge-Finding Stud Finder with Metal Scanning Stud Scan Mode: determine the edge of a wood or metal stud with accuracy of 1/8 inch DeepScan Mode: determine the edge of a wood/metal stud with accuracy of 3/16-inch Metal Scan Mode: determine location of 1/2-inch copper pipe with accuracy of 1/8-inch WireWarning detection indicates the presence of live, unshielded electrical wiring up to 2" deep Audio signal as well as Spotlite identify target edges