1.thermocouple type k,r,b,s 2.high temperature furncae thermocouple 3.aluminum ceramic sheathed tube 4.wearable,high accuracy Platinum Noble Metal ThermocouplesSpecial thermocouple is made of noble metal,( platium in high purity as cathode, Platium and Rhodium alloy as positive pole), corundum as external tube, which is used to measure as high as 1800 like powder metallurgy,fritting furnace, ...