Type K Thermocouple Daughter Board is specifically designed for the DuetWifi and the DuetEthernet that allows two Type K Thermocouples to be attached.
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Informations about type K thermocouple doughter board
This board is based on the MAX31855 chip so only Type K thermocouples are supported.
The DuetWifi and DuetEthernet support up to two daughterboards, with a further two on a Duex2 or Duex5 expansion board, with 4 daughter boards a total of 8 thrmocouples are supported. Thermocouple and PT100 daughterboards can be mixed and matched.
Full documentation is available here