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CARBON DIOXIDE METER Autopilot APCEM2 Desktop CO2 Monitor and Data Logger Monitors carbon dioxide, relative humidity, and temperature of your grow room or greenhouse on a clear LED screen (2 Pack)

MEMORY Digital memory chart shows and records stats over an adjustable 24-hour or 7-day period; The trend chart shows variable Min/Hr/Day/Wk for readings of CO2/RH/Temperature

SENSOR & ALARM 2-channel low drift NDIR gas sensor and audible alarm for low or high CO2 levels

OPERATING TEMPERATURES Operates in temperatures 32 to 122 degrees F; Operating and storage relative humidity (RH) 0-95%, noncondensing

FUNCTIONALITY Features multiple hanging options with the hook-and-loop fastener along the back that attaches to an external battery pack (battery pack not included); Green power supply is compatible with a standard smartphone charger; Dimensions (L x W x D) 4.7 x 3.6 x 1.1 inches; Quantity 2