Challenge Technology - Leader in Civil Engineering Research Equipment Challenge provides respirometers for variety of scientific applications. The AER-200 aerobic/anaerobic system is useful in the study of gases such as Hydrogen, Methane, Co2 and others. The system was developed specifically for the measurement of Oxygen uptake in wastewater sample testing but has been found to be an excellent choice for any type of aerobic or anaerobic study. The AER-200 Respirometer is the most flexible system on the market able to grow with your needs from 8 to 16 and up to 24 reactors being monitored throu