The Klein Tools Edge-to-Edge Stud Finder (ESF050) is a compact electronic stud finder for locating wood and metal studs behind walls. This is an edge-and-center stud finder designed for hanging TVs, shelves, cabinets, grab bars and anything else that needs to land in framing instead of hollow drywall. Klein model ESF050 runs on two AAA batteries, which are included.

Where it earns its name is the edge-to-edge read. In one continuous pass, LEDs light up for the first edge, the center and the second edge, so you know the full width of the stud and not just a single beep somewhere near it. Doubled studs and multiple studs show up as a wider read, which helps when you are trying to land a lag bolt dead center near a window or door opening.

Fast auto-calibration means no calibration routine to get wrong. Set it on the wall, power it on and scan. Klein rates scan depth at up to 3/4" (19 mm) for wood and metal studs, which covers standard drywall and plaster-over-lath depths. Audible alerts back up the LEDs and can be muted when you are working in an occupied home. It does not detect voltage or live wires, so use a dedicated voltage tester before drilling near electrical.

The single-touch power button lights green when the unit is on and stays on without being held, until you turn it off or it automatically shuts down. The body is PC/ABS, about 5-11/16" long x 2-7/16" wide x 1-1/8" tall (14.5 x 6.1 x 2.8 cm), weighs 4 oz (113 g) and is drop-rated to 6.6 ft (2 m). Built-in guards keep fingers off the wall surface, and protective pads on the back help prevent marks on finished walls. Operating range is 32-122°F (0-50°C).

Who should buy it: electricians and low-voltage installers mounting boxes and brackets, remodelers, handymen and homeowners who want a straightforward stud finder that shows edges and center without a learning curve.

Edges, Center, Done

The Klein Tools Edge-to-Edge Stud Finder (ESF050) shows the full width of a stud in one pass, which is what you actually need to hit framing on the first try.

• Who it's for: Electricians, installers and homeowners mounting anything heavier than a picture frame.
• Why it stands out: Edge-and-center LED read, auto-calibration and a one-touch power button that stays on.
• Worth knowing: It does not detect live wires or voltage, and scan depth tops out at 3/4" (19 mm). Use a voltage tester before you drill.

• Does the Klein ESF050 find metal studs? Yes. It detects both wood and metal studs.
• How deep does it scan? Up to 3/4" (19 mm).
• Will it detect live wires? No. Klein lists no voltage or live-wire detection.
• Are batteries included? Yes. It ships with two AAA alkaline batteries.
• Do I have to hold the button while scanning? No. A single press turns it on, and it stays on until you turn it off or it shuts down automatically.