Features: Super Accurate, Super Stable, Super Value For Use with Temperatures Up to 1335 oC (2440 o 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). Specifications: Length: 4" Diameter of sheath: 3mm diameter Positive Material: Ni-Cr Negative Material: Ni-Al Highest Temperature: 1200 oC Lowest Temperature: -200 oC Application Note: Replacement thermocouple for KSL1100XS, KSL1200XJ, and OTF1200XIIS. If necessary, please check out K 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 a K-type thermocouple: positive and negative. Please check the polarity of the K K-type thermocouple before use. The wrong polarity may cause a 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.