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The MLX90614 family of sensors use infrared thermopile detectors to determine the temperature of objects without touching them. This sensor can tolerate ambient temperatures from -40 to 85 degree centigrade and works for object temperatures from -70 to 382.2 degree centigrade. It provides a measurement resolution of 0.02 degree centigrade and has an accuracy of ±0.5 degree centigrade at room temperature. The device comes in a compact TO-39 package that weighs just 0.03 oz (0.9g), and it features filters that give it immunity from ambient IR and sunlight. The sensor uses the serial I2C protocol.