As a combination of distance meter and multi-detector, CB-1009 4-in-1 Distance Meter is perfect for real estate or building-industry professional who needs to know quickly a measure or a calculation of a room based on measurerd data and locate the position of studs, ceiling joist AC wires and metal with high precision in a few seconds. It can measure distances in a straight-line from 0.60 m to 15 meters (measures from bottom of the meter.) It locates the extract position of studs, ceiling joist. AC wires and metal through drywall, concrete and other common wall materials.