A device for non-invasive measurement of the internal temperature of a
physical body or thermal resistivity, the body comprising a thermally
conductive medium between an internal region with a substantially
constant internal temperature and an external surface with a surface
temperature. The device comprises: a patch comprising one or more contact
components for attachment to the external surface and an insulating cover
for substantially thermally insulating the contact component from ambient
thermal conditions; a reader for acquiring one or more thermal magnitudes
on the patch; a processing unit for processing the thermal magnitudes to
derive the internal temperature of the internal region or the thermal
resistivity of the conductive medium.