Huntingdon Fusion Techniques (HFT) offers the PurgEye 100 weld purge monitor that can read accurately down to 100 ppm. The monitor features an auto calibration at the touch of a button. It is IP65 rated for water and dust and also features a low sensor and low battery indicator. The large, easy-to-read digital screen lets the operator immediately know when it is safe to start welding. The monitor indicates oxygen levels from atmospheric (20.94 precent) down to 100 ppm, which makes it perfect for welding stainless steel.