Platinum rhodium thermocouple and precious metal thermocouple used in industry, it USES high pure platinum as anode, precious metals platinum rhodium for positive, used in powder metallurgy, bright sintering furnace, vacuum furnace, melting furnace and a variety of refractory materials, ceramics, porcelain firing, outer tube is made of corundum, measuring temperature fluid over a range of 0-1800 ℃, steam and gas medium and solid surface temperature.