The specs say my Dell Precision M3800 has an air temperature sensor.
I can't find any way to read the value. Is there a way that can be accessed from within windows?
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According to the Dell manual I can't find a reference to an air temperature sensor as you describe.
Normally there are sensors on the motherboard to monitor the internal temperature of components such as the CPU and graphics card. Normally these aren't accessible to users but software like SpeedFan mentioned by @DavidPostill can show the temperatures.
Depending on system load these temperatures can range from 30C up to 80C. I have attached a screenshot of my system.