Review on 🌬️ 6-in-1 Indoor Air Quality Monitor: CO2 Detector, PM2.5 Pollution Sensor, Temperature & Humidity Reader - Real Time Monitoring and Alarm by Sean Garrison

I purchased this unit because I was concerned about the airflow in my classroom. I have read that classrooms often have a high concentration of CO2. Has the meaning. Many people. Lots of CO2. I can't keep it on because my class is above 1100 90% of the time so the damn machine is signaling high all the time. Good to know, but I don't have a way to fix it or turn off the beeps. The audio signal does not contribute to a productive lesson. Every time I go to check the levels it keeps beeping and interrupting the class. So completely useless for me. I wish there was a way to keep track of the levels without the beep. This seems accurate as it shows 400 for CO2 out there which I've read is normal.