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Metal scanners- do they work?

2711 Views 12 Replies 11 Participants Last post by  old55
I'm wondering this woodworking equipment is helpful in the process of woodworking.
It is said that it can detect nails in wood.
Does it really work?
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I have one that was purchased at Harbor Freight. It has work well each time I use it. I have owned it for about 4 years.
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