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Tempdrop measures your armpit temperature throughout your sleep. Measuring your armpit temperature for a minimum of 12 minutes is equivalent to measuring your core body temperature.

Rubia-Rubia, J., Arias, A., Sierra, A., & Aguirre-Jaime, A. (2011). Measurement of body temperature in adult patients: comparative study of accuracy, reliability and validity of different devices. International Journal of Nursing Studies, 48(7), 872–880. doi: https://doi.org/10.1016/j.ijnurstu.2010.11.003