Nobel metal thermocouple are made from a combination of two different metals, typically platinum and rhodiumNobel 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.