SAVE $50.99$199.99$250.98Temtop M2000C 2nd+ P10 Air Quality Monitor Combo, CO2 Detector with PM2.5 PM10 Temperature and Humidity Monitor/Audio Alarm Data ExportAmazon- $179.99Temtop Advanced Air Quality Monitor for CO2, PM2.5, PM10, with Audio Alarm, Temp & Humidity Insights, Plus Data Export for in-Depth Analysis, M2000C 2NDAmazon