... Head:604/602 Type High accuracy,rapid reaction and stability Pt-Rh type thermocouple sensor is uesd for measuring the temperature ... . Type Model +leg -leg R QR-KR PtRh13% Pt S QR-KS PtRh10% Pt B QR-KB PtRh30% PtRh6% WRe QR-KW ... 1650°C : 7 seconds.Measuring time : 3 to 6 seconds. Pt-Rh type thermocouple sensor(Type S,R,B and Wre)