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Black & Decker stud sensors detect both wood and metal studs and can also detect live AC wiring.
They use LED indicators that light up to show where a stud is located.
These stud sensors can detect through materials up to about 3/4 inch (0.75 in.) thick.
Dimensions range roughly from 8.5 × 1.76 × 4.12 inches up to 10.5 × 2.75 × 7.88 inches, with weights from about 0.35 lb to 1 lb.
Auto-leveling models level automatically without manual adjustment and project a horizontal laser line to help align hanging projects.
The auto-leveling laser is listed as a Class 3R laser product with a power output of less than 5 mW.
The auto-leveling device is described as a 2-in-1 tool — two tools combined in one unit.