Kestrel Instruments which measure Temperature
Unlike most watches and other products with a temperature measurement, the Kestrel sensor is outside the case to ensure it measures the air, not your hand or pocket. The "curls" serve to further isolate the temperature sensor from the effects of the case temperature. Again, simply wave the Kestrel back and forth a few times and you’ll have accurate air temperature readings in seconds. And, since the Kestrel is completely waterproof, you can actually take water temperature and snow temperature readings – simply submerge the sensor in the water or snow. Just ask the US Biathlon team – they used Kestrel 4000’s in the 2006 Winter Olympics to measure air and snow temperature to determine the appropriate wax to use on their skis.
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Kestrel DROP D3 Bluetooth Data Logger - Temperature | Humidity | Pressure