ezt vadászom én is mostanában.

max 31855 vs max 6675 ic-k.

csomagban 2-4ezer péz ebajon.

http://www.ebay.com/itm/MAX31855-Module-K-Type-Thermocouple-Thermocouple-Sensor-for-Arduino-UNO-Mega-/121477657196?pt=LH_DefaultDomain_0&hash=item1c48a1f26c

http://www.ebay.com/itm/MAX6675-Module-K-Type-Thermocouple-Thermocouple-Sensor-for-Arduino-R3-NEW-/321569936541?pt=LH_DefaultDomain_0&hash=item4adf0fd49d