Not that I needed proof, Back in early 2021, I personally saw two grassroots demonstration of people with a basic safety in mine background connecting such a CO2 sensor under a mask and showing the physiological insult.
Back in early 2021, I personally saw two grassroots demonstration of people with a basic safety in mine background connecting such a CO2 sensor under a mask and showing the physiological insult.
Not that I needed proof,
Back in early 2021, I personally saw two grassroots demonstration of people with a basic safety in mine background connecting such a CO2 sensor under a mask and showing the physiological insult.