AER-200 Respirometer
Designed for batch and laboratory applications, the AER-200 Respirometer
can be used for both aerobic and anaerobic wastewater applications.

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Soil Column

AER-200S  Soil/Compost Respirometer
A uniquely designed reaction chamber for determining soil, compost, and/or
biosolids respiration rates. 

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Soil Column

ODM-100 Oxygen Demand Monitor
The ODM-100 Oxygen Demand Monitor is a rugged unit designed to measure and record oxygen demand either continuously or in batch mode according to your needs. 

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DFM-502 Dual Digital Flow Meter
The DFM-502 dual digital flow meter was designed to replace wet test meters and similar low-flow devices for measuring gas flow from points of production or to points of use.
Jar Tester
JTA-204 Portable Jar Tester
Challenge Technology took the extremly reliable and light stirrer and made
the only truly portable jar tester.

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MS-300 Magnetic Stirrer
The MS-300 Series stirrer was developed to meet the high stirring speeds
required to eliminate oxygen transfer limits and yet remain spin-off proof.

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