Basic Zircon StudSensor™ stud finders with only Stud Scan and/or DeepScan® mode are not recommended for lath and plaster walls.
However, MultiScanner™ models with Metal Scan mode (or a dedicated metal finder) can be used to locate the pattern of nails or screw heads attaching the wood lath to the studs. The nails or screws should be found in a column when scanning for metal.
More info – Zircon Tip Minute 8 – Scanner Lath and Plaster Walls
Note: If metal mesh reinforcement was used in the construction, even the Metal Scan mode (or metal finder) may be unable to help you find the stud through the material.
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