Meter Oxygen Meter – WL-220 WELLHISE HT-501 CO2

The WL-220 WELLHISE HT-501 CO2 METER OXYGEN METER is a device used to measure carbon dioxide (CO2) levels and oxygen (O2) concentration indoors. Such devices are often used to monitor air quality indoors. The HT-501 model is a monitoring tool that is often used in offices, schools, hospitals, shopping malls and other indoor areas. The device is used to monitor CO2 levels that affect air quality and to ensure that oxygen is at adequate levels.