... theworld 4.Patent product. Diboride Zirconium Composite Ceramic Thermocouple Sigma Patent Product Details: Products purpose:It widely used for ... filling materials, junction box, signal regulating and transform circuit, sigma temperature-control meter, connecting line and other assistant devices.The ... customized size Materia: tube Diboride Zirconium Composite Ceramic Thermocouple Sigma Patent Product