Positive Temperature Coefficient (PTC) thermistor temperature sensors are devices that increase their resistance with temperature. Compared to other temperature sensors, thermistors produce a larger output signal and are easy to measure, but they can be unstable and not suitable for precise temperature measurements. These devices are particularly suitable for overheat detection, often showing a clear nonlinear temperature-resistance relationship, making them suitable for detecting imprecise "high" temperatures, but not the most suitable for accurate measurement applications.