A type B platinum thermocouple is good for this temperature.
As I suggested on an earlier thread, All one really needs is one thermocouple, and place a sample of the Alumina rfractorey in a small oven. Having set the IR camera up before closing the oven door, just open the door and take a quick reading when the sample is up to temerature. All we need is rough confirmation of the temperature measurement in the Lugano test.
