• Accuscan technology is specifically calibrated for finding studs behind drywall up to 3/4" in depth.
• Auto marking, no need for pencils and it keeps the surface clean.
• Automatic on/off with surface contact.
• LED and audio alerts clearly identify stud location.

Strait-Line Depth Stud Sensor - STRAIT-LINE DEPTH STUD SENSOR. Deep scan stud sensor. Locates wood, metal studs, wiring & plumbing. Interactive LCD screen DEPTH:3/4"

very simple and basic and don't do it's job well at all. i've tried just simply to locate studs through drywall (both wood and metal) and it seems to think there is 2" and 3" wide studs every few inches in the wall. i don't know if it picking up conduit or plumbing, but i read the directions and followed them exactly and havn't had consistent restults once, even on wall is my house i know to be 16" oc with nothing but insulation in between and it still acts funny. i'll be trying the zircon one next, may you get what you pay for and if you want profession results you have to pay for one of the more expensive models...i just know this one isn't worth the hassle.