Irvine-based Specific Media, a major online advertising network, has rolled out a new product geared at offline sales reporting, the firm disclosed today. According to Specific Media, the new tool will help reveal the correlation between online advertising campaigns and offline purchase behavior. Specific Media is tapping data from comScore and Nielsen Online to track consumer purchases resulting from online advertising campaigns, so advertisers can accurately measure ROI of those campaigns. The firm said it will offer its offline sales impact reports for customers in the retail, automotive, consumer packaged goods, entertainment and travel categories.