The first product in the iButtonŽ line of Temperature Sensors is the DS1920. The DS1920 is a digital thermometer that reads the current temperature of the environment or object to which it is attached.
Temperature Data Loggers
The ThermochronŽ family of iButtons are globally addressable, dedicated trackers that can go wherever thermally vulnerable products go, monitoring time and temperature and storing the data. The data can then be easily uploaded and analyzed to detect possible thermal damage.
http://www.maxim-ic.com/products/ibutton/ibuttons/thermochron.cfm
