A high-tech shipping label now being used by some in the industry aims to warn customers if there's a chance they're getting cooked cabernet. About the size of a sugar packet, the labels can be programmed for a range of temperatures and placed directly on the product or its packaging. A light flashes green if the product stays within specifications and yellow if it doesn't. Information on exactly what temperatures the product reached and when can be downloaded via a portable reader into a computer spreadsheet. If there is a problem, the data show where it occurred, helpful in determining who's responsible. Among those using the technology is WTN Services, a Napa-based shipper that has been offering the temperature monitor to customers of its retail brand Ambrosia, a wine catalog, and is now making it an option for other wineries shipping through WTN.