Information on temperature measurement and thermocouples by Peak Sensors
Mitsco thermocouples - good value R and K thermocouples
Avery Weigh-Tronix thermocouple calibration - inexpensive calibration, but to a low temperature for kilns
Sterling Sensors - wide range, but R/S are very expensive
TMS Europe - thermocouples, loggers, ceramic tubes etc.
Omega - thermocouples and many other sensors and loggers
RS - data loggers etc.