American Marathon oxygen probe is widely recognized in the industrial field and has become a standard, with a working temperature range of 700-1100.  RA330 alloy protective tube is adopted, which is durable and has long-term excellent red hardness, corrosion resistance and high temperature resistance.  It can be inserted into the furnace at 10 °, and various sizes are available, including 600mm, 800mm, 1000 mm and 1200 mm, to adapt to different furnace types or installation methods. The new oxygen probe has good consistency and fast recovery time of charcoal burning, and the service life of oxygen probe is > 18 months, which is suitable for various processes such as carburizing, carbonitriding, super carburizing and nitrogen-based atmosphere carburizing.