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.