Here are a few responses from our customers on the Challenge AER-200 respirometer system:

• “We have found the performance of the system to be quite satisfying and user friendly. We are currently running low level O2 uptake experiments and are impressed with the sensitivity of the instrument.”

Wendy Segal
Research Technician
BetzDearborn Division of Hercules, Inc.
Trevose, PA

• "I have found the performance of the Challenge AER-200 to be unmatched. The precise measurement of oxygen consumption, homogenous mass transfer of test materials, and constant and consistent operating temperature have enable me to obtain extremely accurate test results, particularly as compared to other respirometer systems…. I find the Challenge system to be extremely user friendly."

Randy Drake
Senior Biologist
River Bend Labs
St. Louis, MO

• "The AER-200 System is quite simple to use and its computer based interface is very user-friendly. Our experience with the system has been very positive and its performance has been excellent. More importantly for our purposes, we found this system to be very reliable and exceptionally accurate."

M. F. Dahab, Ph.D.
Professor of Civil Engineering
University of Nebraska
Lincoln, NE

• "We have used a Challenge Environmental respirometer for more than 8 years. We have been very satisfied with our Challenge Environmental respirometer systems. The equipment is user friendly and provides real-time data. It has been a reliable tool that has produced data that meets our needs. There are other more expensive systems on the market, but the data you get is not as effective as from the Challenge Environmental Systems equipment."

W. J. Wujak
PMC BioTec
Exton, PA

• "We have used the Challenge AER-200 respirometer system for research and teaching purposes, including applications such as BOD kinetics and toxicity studies. In all cases, we have found the system to be user-friendly and the performance to be excellent. Furthermore, the customer service provided by Challenge Environmental Systems, Inc. has been very satisfying."

Eric A. Seagren, Ph.D.
Assistant Professor of Civil and Environmental Engineering
University of Maryland
College Park, MD