The Model 1205A-0 handheld CO analyzer from Dwyer Instruments, Inc. is suited for ambient air monitoring, flue testing in small boilers, and source investigations. The portable, battery-operated unit measures CO from 0 to 2,000 ppm in 30 sec, and has an accuracy of ±5% of reading with a response time of 30 to 40 sec. The ambient operating temperature range is 32 degrees to 104 degrees F.