There are a few important design considerations to implement to achieve accurate body temperature measurements. The most important design consideration is that the main sensor should be placed as close to the tympanic membrane of the ear and isolated from other heat sources such as ambient temperature or heat from the system. Secondly, other electrical components that generate heat such as batteries or microprocessors should be placed far from the main sensor. This is to minimize the heat transfer that can cause temperature errors to the main sensor. The hearable casing should also create a tight seal of the ear canal to limit temperature error from the ambient air. The secondary sensor should be placed by any heat source that can create a temperature error on the main sensor. This is to calibrate and correlate temperature affects from those heat sources.