Air Systems International CO-91HACG Portable CO Monitor features an audible alarm of 90 dBA. The alarm and light incorporated in its design gets activated when CO content exceeds 10ppm (5ppm for Canadian models). It has an external alarm and light which protects the internal components of the monitor from getting contaminated or damaged. The CO Monitor operates on 9 volt batteries, 16 to 8 VDC and/or 115 VAC.
The CO91-HACG is rated for 6000 PSI Max. pressure & includes a regulator & calibration gas cylinders.