Plaster and lath walls can confuse basic stud finders because wall thickness and density are less consistent than modern drywall. We compared deep-scan capability, fastener detection, ease of use, and suitability for older wall construction to find five practical options.
These are research-based recommendations; we have not physically tested these products.
At-a-Glance Comparison
1. Franklin Sensors ProSensor M210 — Best Overall
Key Spec: 13 sensors, 1.7-inch detection depth
Best for: Most older plaster-and-lath walls
Pro: Shows the full width of the stud with no calibration required
Con: May struggle with metal-mesh reinforced plaster
Quick Verdict: A strong balance of depth, simple operation, and full-width stud detection.
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2. Franklin Sensors ProSensor MAX — Best for Thick Plaster
Key Spec: 13 large sensors, up to 2.5-inch maximum scanning depth
Best for: Thick or layered plaster walls
Pro: Dedicated deeper scanning mode for lath and plaster
Con: Larger and more expensive than basic stud finders
Quick Verdict: The better choice when standard-depth scanners cannot reach through thick walls.
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3. Zircon MetalliScanner m40 — Best for Finding Lath Fasteners
Key Spec: Dedicated electronic metal detection
Best for: Locating nails or screws holding wood lath to studs
Pro: Specifically supports finding studs in lath-and-plaster by tracing fasteners
Con: Detects metal rather than the wood stud itself
Quick Verdict: A practical option when density-based stud finders give confusing readings.
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4. StudPoP Original — Best Magnetic Pick
Key Spec: 1-inch magnetic detection mechanism
Best for: Simple battery-free stud finding in wood-lath plaster walls
Pro: No batteries or calibration required
Con: Not suitable when the plaster contains metal mesh
Quick Verdict: A simple magnetic option that can locate hidden fasteners through plaster and wood lath.
[Check Price on Amazon → AFFILIATE LINK ]
5. Bosch GMS 120-27 — Best Multi-Purpose Wall Scanner
Key Spec: Detects metal, live wires, and wooden substructures
Best for: DIYers who also want to check for metal and wiring
Pro: Multiple detection types in one rugged tool
Con: Wood detection is optimized for dry-wall construction rather than difficult plaster surfaces
Quick Verdict: Best when you want a broader wall scanner, not just a basic stud finder.
[Check Price on Amazon → AFFILIATE LINK ]
What to Look for in a Stud Finder for Plaster Walls
Look for Deeper Scanning
Old plaster can be much thicker and less uniform than drywall. A model designed for roughly 1.5 inches or deeper gives you more room to work with layered walls.
Understand Magnetic vs Electronic Finders
Electronic models try to detect changes behind the wall, while magnetic and metal scanners locate the nails or screws attaching wood lath to studs. On difficult plaster, tracing fasteners can sometimes be the simpler approach.
Watch Out for Metal Lath
Metal mesh reinforcement can confuse both electronic and magnetic detection. If the wall contains metal lath, no basic stud finder should be treated as foolproof.
Frequently Asked Questions
Do normal stud finders work on plaster and lath walls?
Some do, but standard shallow scanners can struggle because plaster thickness and wood lath create inconsistent readings. Deep-scan or fastener-detection methods are usually more suitable.
Can a magnetic stud finder work through plaster?
Yes, if it can detect the metal nails or screws attaching wood lath to the studs. However, walls reinforced with metal mesh can make magnetic detection unreliable.
Final Verdict
The Franklin Sensors ProSensor M210 is our top research-based pick for most plaster-and-lath walls, while the ProSensor MAX is better for particularly thick surfaces.
For a simpler battery-free approach, the StudPoP Original is a useful alternative, while the Zircon m40 is especially helpful for tracing lath fasteners.