With the Quantified Self movement becoming prevalent, more people are looking to incorporate technology to acquire data regarding aspects of a persons daily life in terms of inputs (e.g. food consumed, quality of surrounding air), states (e.g. blood oxygen levels, body temperature), and/or performance. This self-monitoring concept combines wearable sensors with computing devices to produce an output to improve daily functioning. Disclosed is a device that senses and measures the created cavity temperature (CCT) within an artificial cavity in the wearers body. This current device provides a wearable thermometer that measures temperature for a convenient, comfortable method of continuously tracking the wearers temperature.