## Common ground
All options are devices that detect and monitor volatile organic compounds (VOCs) in the air.
## Options at a glance
**9025.80 – Air quality monitor with sensors**
- **Defining trait:** Includes integrated humidity and temperature sensing alongside TVOC detection.
- **Typical examples:** Indoor air quality monitors for homes or offices.
- **Best fit when:** Monitoring environmental conditions (temp/humidity) along with VOCs is essential.
**9027.10 – VOC gas/chemical detector**
- **Defining trait:** Focuses on detecting and monitoring volatile gases or chemicals, without specifying measurement method.
- **Typical examples:** Industrial leak detectors or chemical safety monitors.
- **Best fit when:** The primary purpose is identifying specific volatile gases, not ambient air quality.
**9027.50 – Optical radiations (photometer-type) monitor**
- **Defining trait:** Uses optical radiation (e.g., UV/IR spectroscopy) to measure TVOCs.
- **Typical examples:** Laser-based or spectrometric VOC analyzers in labs or industrial settings.
- **Best fit when:** The device relies on light absorption or emission for detection, not electrochemical sensors.
## Key differences
| Feature | 9025.80 | 9027.10 | 9027.50 |
|-----------------------|--------------------------|----------------------------|------------------------------|
| Additional sensors | Yes (humidity & temp) | No | Not specified |
| Detection method | Implied electrochemical | General gas detection | Optical radiation (photometer) |
| Primary use case | Indoor air quality | Industrial/chemical safety | High-precision or lab settings |
## How to choose
- Does it measure temperature and humidity alongside VOCs? → 9025.80
- Is it designed for detecting specific volatile gases in industrial or safety contexts? → 9027.10
- Does it use light (e.g., laser, UV/IR) to detect VOCs? → 9027.50
## Overlaps & pitfalls
A device could qualify for both 9025.80 and 9027.50 if it uses optical sensing *and* measures temp/humidity. Similarly, 9027.10 may overlap with others if it detects VOCs via any method. **No option takes priority**—choose based on the product’s MAIN function: environmental monitoring (9025.80), gas detection (9027.10), or optical sensing (9027.50)