Gadget Freak Case #257: TempBug -- Internet-Connected Thermometer
You can put this thermometer anywhere with WiFi and collect data for months to years on a single battery, depending on how often you check the temperature.
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I have one room in the addition on my house that never warms up properly in winter. I would like to use this technology to track the temp over time. Right now, I press the "on" button on a digital thermometer and track it by memory. In northern climates, I'm sure there are many homeowners like me who'd like to see a printout.
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