Cheap Damp meter test

I thought I'd test a cheap damp meter to see how it compares to our expensive one we use in the workshop after seeing a post advertising a cheap one in lidl, can you get something for around £30 that is any good? This is the one I used . amzn.eu/d/5sHq9yx For more information on caravans please visit my website www.atlanticcaravans.co.uk/help

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