Features: Super Accurate, Super Stable, Super Value For Use with Temperatures Up to 1335°C (2440°F) Excellent Long-Term Stability at High Temperature Nickel-Chrome Based Superalloy Sheathing Provides Excellent High-Temperature Performance Excellent Oxidation, Carburization, and Chlorination Resistance Made with materials of Special Limits of Error. Perfect for calibrating MTI tube furnaces using a precision temperature calibrator (matched with a standard plug; related product below) For MTI's KSL-1200X Series Specifications: Length: 6" Diameter of sheath: 3mm diameter Positive Material: Ni-Cr Negative Material: Ni-Al Highest Temperature: 1200°C Lowest Temperature: -200°C Application Note: If necessary, please check out K type thermocouple extension wire with mini male plug. Using compensating wires is equivalent to stretching them to keep them operating at a constant temperature. The advantages of using compensating cables are saving material costs and solving the problem of constant temperature, etc. There are 2 polarities for K-type thermocouples: positive and negative. Please check the polarity of K type thermocouple before use. The wrong polarity may cause the temperature measuring error. It is also easy to test the polarity of K type thermocouples. The negative wire is MORE magnetic than the positive wire. Just put a magnet up to each wire. One will be more magnetic than the other.