LogTag Temperature with Built-In USB If you only have one or two sites to monitor, the LogTag with built-in USB makes great sense because you do not have to buy the separate USB Reader. This model has a USB plug. Take it out of the fridge and stick it straight into the USB port on any Windows PC. It uses the same easy-to-use LogTag Analyzer software as other LogTags. When you plug it into the computer, it appears as a drive and opens a folder window. That folder will contain a PDF copy of the temperature data report, ready to save or email. This LogTag is an excellent replacement for vaccine fridges with old and unavailable external loggers. Just place it directly in the fridge with the vaccines.