Measuring and Layout — FAQ
How do magnetic stud finders work?
They use strong magnets to detect steel screws or nails fastening drywall to studs. When you sweep the tool across a wall, the magnet attracts to hidden metal fasteners, visibly snapping or clicking to signal location. No batteries or calibration needed.
Can magnetic stud finders detect studs through plaster walls?
Yes, but magnet strength matters. Standard magnets work through 1/2-inch plaster, but lathed plaster walls need 20+ pound pull force. Tools like the StudPoP with audio feedback excel in thick plaster where visual cues are harder to see.
What's the difference between magnetic and electronic stud finders?
Magnetic finders detect metal fasteners; electronic finders sense density changes in the wall. Magnets never need batteries and find the actual fastener location. Electronics can locate stud edges but require calibration and struggle with plaster.
How strong should a contractor-grade magnetic stud finder be?
Look for 15-30 pounds of pull force. This detects screws through 5/8-inch drywall, 3/4-inch plywood, and most plaster applications. Weak magnets miss fasteners and force multiple passes, wasting time on commercial jobs.
Will magnetic stud finders work on metal studs?
They detect steel studs but won't differentiate stud from fastener. The entire wall surface attracts the magnet, making them ineffective for metal framing. Use electronic finders or scanning tools specifically designed for metal stud detection.
Can these tools detect pipes or electrical wires?
Magnetic finders only detect ferrous metal. They'll find steel pipes but won't locate copper, PEX, or electrical wires. Never rely on them for utility detection. Always use dedicated pipe and wire scanners before drilling.
