- Air Quality Monitoring with OPSIS DOAS
- Annual Calibration
- Benzene Monitoring
- Data Handling
- Dioxins Monitoring
- Fence-line Monitoring
- H2S Monitoring
- Marine Monitoring
- OPSIS Data Services
- OPSIS Monitoring Services
- Real Driving Emissions
- SO2 Monitoring in Sulfuric Acid Plants
- System 400 - Three solutions
- System 400CS
- System 400FL
- System 400Hg
- System 400HWE
- Waste-to-energy Plants
- Web Logger