This is the surprise of the year for me. I wouldn't have thought I would use (and need) a CO2 monitor daily. These days, when the A/C is on quite often, this device makes me realize that my concentration slips not because of the heat, but because the room lacks fresh air. When the CO2 concentration is above 1000 ppm, it enters the yellow zone, which is not critical, but I realize it's already too high for me. So, whenever you are feeling drowsy at work, open the window first before turning up the air-con! You might just need some fresh air - no matter how hot it is. We even wrote about this issue, including the device I tried, check it out: https://lnkd.in/eBtqe8b #DigitalHealth #AirQuality #AirQualityMonitor #CO2Monitor #OpenTheWindow …see more