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High CO2 concentration will affect productivity and learning ability. A high concentration of particulate matter will cause certain harm to the respiratory tract So monitoring Indoor air quality is important. 【Multifunction Air Quality Meter】:Our air quality monitor indoor measures particulates(PM2.5,PM10), carbon dioxide, AQI, Temperature, and Humidity in the air.

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【Portable CO2 Detector】: The 3 in 1 CO2 monitor use NDIR technology which can sense CO2, humidity and temperature. It is designed as portable, so you

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CO2 Meter Air Quality Monitor Handheld CO2 Monitor 0~9999ppm Measurement Carbon Dioxide Temperature Humidity Detector NDIR Sensor Indoor Outdoor Air Quality Tester: : Industrial & Scientific

【Multifunctional Meter】This air quality meter may give a accurate reading of CO2 concentration, humidity and temperature, the measuring range of CO2

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INKBIRDPLUS Indoor CO2 Detector Air Quality Monitor Tester for Carbon Dioxide

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Newentor CO2 Monitor, Carbon Dioxide Detector, Large Display CO2 Meter with Voice Alert, Indoor Air Quality Monitor, Temperature Humidity Sensor, Alarm Clock for Home, RV, Office, School, 400-5000ppm

CO2 Controller Carbon Dioxide Monitor Meter Day and Night Control Relay Function 4.5m NDIR Sensor Probe Cable for Green House Grow Room Factory Home Office (CO2 Meter) - Yahoo Shopping

CO2 Meter Air Quality Monitor Handheld CO2 Monitor 0~9999ppm Measurement Carbon Dioxide Temperature Humidity Detector NDIR Sensor Indoor Outdoor Air Quality Tester: : Industrial & Scientific

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AQM-396 Carbon Dioxide CO2 Monitor Wall Mount Indoor Air Quality Meter – Gain Express

6-in-1 Indoor Air Quality Monitor Detects CO2 PM2.5 PM10 AQI Temp Humid Alarm CF

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Smart CO2 Detector, Indoor Air Quality Monitor, NDIR Sensor Carbon Dioxide Detector, Temperature Humidity Air Tester for CO2 Alarm