metal thermocouple

Nobel metal thermocouple are made from a combination of two different metals, typically platinium and rhodium . Nobel metal thermocouples are much more accurate and stable.   this type of thermocouple are used in a wide variety of industrial applications.
nobel metal thermocouples are well known for their accuracy and temperature sensitivity.   
>  R type has the widest temperature range, from 0 to 1600 deg c. R type is made of platinium and rhodium.
>S type has a narrowest range , from  0 to 1600 deg c. S type is made of  platinium & palladium .
>B type has narrowest range , from 600 to  1700 deg c. B type is made of boron and silicon .
> C Type  Tungsten /Rhenium , from 600 to 2200 deg c.