Check for proper installation of ventless fireplaces, furnaces and other combustion devices; conduct CO tests in room air to meet OSHA and ASHRAE standards. This state-of-the-art carbon monoxide detector is designed to measure CO in ambient air. Measuring from 0 to 999 ppm, carbon monoxide readings are displayed in 1 ppm increments. Featuring a personal audible and visual alarm, which is factory set at 30 ppm CO, but can be changed in the field to keep current with government and safety standards.

Features:

• Maximum reading hold
• Elapsed time (in hours & mins.) and manual zero
• Audible alarm on/off switch
• Includes 2 AA batteries