Is this unit compatible with the BAR688HGA base unit?

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What I did to find the outdoor sensor for my weather station was google the product number + user manual.  This site will not allow me to include the link for the pdf file online but you can find the search result easily to get the details.
It's supposed to sync up with mine which is the bar638hga model according to the user manual but I may have gotten a defective one.  I don't deal with return shipping expenses.

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