The Pro Gas Badge Oxygen Monitor is a gas detector specifically designed to detect oxygen levels. This product is brand new in the box, but the parts listed are expired as of December 4, 2019. It is a reliable tool for monitoring oxygen levels in various industrial settings, providing accurate readings to ensure safety and compliance with regulations. The model number 2.90 indicates a specific design and functionality for this gas monitor, making it a valuable asset for those in need of precise oxygen detection capabilities.