Driver for the SainSmart MAX6675 Thermocouple Amplifier Module or Driver for the HUABAN 2PCS MAX6675 K Type Thermocouple Temperature Sensor Module
Library and good instruction on how to use it can be found here: http://m.instructables.com/id/Arduino-and-Thermocouple-K-MAX6675/
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BSD license, all text above must be included in any redistribution.