MAXIM MAX6675 is an American company with a cold junction compensation, linearity correction, thermocouple break detection ADC Serial K-type thermocouple, its temperature resolution capability is 0. 25 Degree, cold junction compensation range - 20 ~ + 80 Degree, wide operating voltage range 3. 0 ~ 5. 5V Operating voltage: 3. 0 ~ 5. 5V