Length: It is up to the customers. Diameter of sheath: 8 mm , high purity 99.8% Alumina tube. http://www.andygroup.com/windows/b5.sb1.1.htm Positive Material: Pt/Rh (30 %) Negative Material: Pt/Rh (6 %) Lowest Temperature: 50 oC Highest Temperature: 1700 oC Minimum Std. Error: +/-1.4 oC