This thermal imaging sensor has saved me hundreds in repairs (plus it works with iOS and Android)

Thermal cameras are very often $200 or more, but this inexpensive model from Thermal Master works for both iOS and Android and has a ± 3.6°F accuracy.
IEEE

A Highly Linear Temperature Sensor Operating up to 600°C in a 4H-SiC CMOS Technology

Abstract: In this work, a highly linear temperature sensor based on a silicon carbide (SiC) p-n diode is presented. Under a constant current biasing, the diode has an excellent linear response to the ...
IEEE

Reference-Free Calibration for Wearable Core Body Temperature Sensor Based on Single-Heat-Flux Method

Abstract: Core body temperature (CBT) is one of the useful physiological indicators that are linked to physiological changes. Wearable sensors are expected to be developed to monitor CBT easily during ...