BW Clip 2 Year CO Single Gas Detector BWC2-M North Another good option would be

Another good option would be a 3M 7500 Respirator

LED and audible warnings let you know when the battery is low

Hydrogen sulfide (H2S)

631LJ-S-M - Small/Medium

BW Clip 2 Year CO Single Gas Detector BWC2-M North Another good option would beThis 2 Year BW Clip from BW Technologies is a maintenance free, single gas detector for carbon monoxide. This monitor has default alarm setpoints at 35 ppm and 200 ppm, with an alarm setpoint range of 5 ppm to 200 ppm. The BW Clip has everything you need for hazardous environments plus new features to make your gas detection easier, safer, and more reliable. Just turn on the device and it runs continuously no need for calibration, sensor replacement,