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Where the BME680 reports a general gas/VOC reading, the BME688 adds onboard machine-learning gas classification, meaning the sensor can be trained to recognise specific gas signatures - distinguishing between different pollutant types or detecting a particular contaminant - rather than just outputting one generic air-quality number. It keeps the same core temperature, humidity, and barometric pressure measurements alongside that upgraded gas-sensing intelligence, making it the more capable option for an air-quality project that needs to identify what's actually in the air, not just that something has changed.
| Brand | Waveshare |
|---|---|
| Selling unit | PCS |
