The air temperature is measured using a Platinum Resistance Thermometer (sometimes referred to as an Electrical Resistance Thermometer).
This thermometer contains a wire that has a resistance of 100.00 Ohms at 0.00 deg C. As the temperature changes so does the resistance of the wire.
Units: Celsius, °C
Range: -30oC - +69.9oC
Resistance: 0.1oC
Accuracy: +/-0.2oC