The replacement DualSense pack of Carbon Monoxide, low hydrogen interference sensors for the Tango TX1-G Gas Detector. The CO/H2 Low sensor has a measuring range of 0-1000 ppm with a 1 ppm resolution. The Cells use two electrodes and a special catalyst with a lower sensitivity to Hydrogen to detect Carbon Monoxide (CO) levels. This reduced the cross interference to Hydrogen (H2) than a standard electrochemical Carbon Monoxide (CO) sensor would read. The DualSense pack comes with 2 CO/H2 Low sensors.