The new AQ200 is a multifunctional, hand-held, highly sensitive and accurate indoor air quality monitor that is ideal for numerous AQ applications. Features include: CO2 Sensor (0 – 5000 ppm), CO Sensor (0 – 1000 ppm), Ambient Temperature (-4 to 176ËšF), Delta T, Atmospheric Air Pressure, Humidity, CO/CO2 Resolution = 1 ppm, IP54 Dust Protection, and more. E Instruments,, (215) 750-1212.