B type thermocouple :
(Platinum Rhodium -13% / Platinum) : The Type R is used in very high temperature applications. It has a higher percentage of Rhodium than the Type S, which makes it more expensive. The Type R is very similar to the Type S in terms of performance. It is sometimes used in lower temperature applications because of its high accuracy and stability. Type R has a slightly higher output and improved stability over the type S.
Accuracy (whichever is greater) :
Standard: +/- 1.5C or +/- .25%
Special Limits of Error: +/- 0.6C or 0.1%