Works great, even through stucco!
I know this isn't a high end product, but I love finding a good deal... and this is it! I needed to trace wires I'd installed in the framing stage which are now hidden behind sheetrock on the inside and stucco on the outside. Amazingly, it works. (Well, once I figured out how to adjust the volume, that is!) I can't wait to use it for other projects!
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