A Ha7Net Adapter, a product from Embedded Data Systems, is a BusMaster Controller that communicates to several digital temperature sensors via a so-called 1-Wire Bus. Each sensor (e.g. from the Dallas/Maxime company) has a unique serial number. All is needed is to set up the hardware and connect the sensors to the adapter.
The adapter has an internal web server which allows to read the values of any of the temperature sensors it is connected to via HTTP. It is accessible from any standard web browser.
SAFO allows read access to the adapter and thus to the temperature sensors. It can read several sensors in one step (however, it apparently takes more time on the adapter side to collect all requested temperature values the more you want the data from).