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This is a $60 air quality meter. It measures AQI, PM2. 5, PM10, Hydrocarbons (HCHO), CO2, Humidity and TVOC but not all at the same time. You have to press the top button to switch between readings. It runs on battery and is rechargeable via micro USB. Mine arrived in like new condition with no instructions. It was easy to set the time and date and appears to function like new.
Verified purchase: Yes | Condition: Pre-owned