This is a DS18B20 precise temperature sensor. The sensor achieves an accuracy of +/- 0.5C over most of it's operating range. The sensor is used over a 1-wire 5V TTL interface. This makes it ideal for general measurements. Formerly TE-233-000
The Melexis MLX90614ESF-AAA is a high-accuracy, high resolution, non-contact thermometer with a 90-degree field of view. It has a measurement resolution of 0.02°C and is factory calibrated for a wide -70 to 380°C object temperature range.