Best Portable CO2 Monitors for Home and Office (2023 Reviews)
- Tyler Vanzo
- Tyler Vanzo
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CO₂ Monitor
Measure CO₂, temperature, and relative humidity
TO CALCULATE THE NUMBER OF RE-BREATHED BREATHS PER HOUR take the CO2 level, subtract 400, and then divide by 40. e.g. If someone smokes marijuana and then breathes it straight into their partner’s mouth, that is a re-breathed breath. If you went up to someone with Covid (or without) and had them breathe directly into your mouth or nose that is a re-breathed breathe. The formula above lets you easily calculate you how often you are doing this per hour (but without the marijuana). If you have a CO2 monitor, you can easily transform the CO2 level into something meaningful… 阅读更多 »
A suggestion for any CO2 monitor manufacturers reading this: Why don’t you add a “Percent re-breathed air” calculation – so that users have an important usable measure available? For everyone else, you can actually calculate this fairly easily: Simply take the CO2 figure, subtract 400, and then divide by 400. This will give you the percent of re-breathed air. e.g. If the monitor reads 500 then about 0.25% of the air you breathe has already passed through another human (who may have Covid). If it’s 2400 then 5% of the air is second hand. (So every 20th breath is equivalent… 阅读更多 »
Some of these CO2 monitors also seem to measure PM2.5, have any tests been done on their PM2.5 accuracy? For example. the DM1307 looks like it may be a good option for something that is very accurate for CO2, and if it also measures PM2.5 accurately, then a good value compared to the PM2.5 list against PurpleAir and such.
Also– PurpleAir claims to detect down to 0.3 micron, what are your thoughts on whether that would help directly detect possible viral levels?
Otherwise, great stuff on the blog posts! Just wish you had more affordable shipping to North America!
I’ve ordered the cheapest listed Tyler, to supplement my Aranet4 – it apparently now comes with a 2Ah battery. Hopefully replaceable!
Of interest CO2 at around 420ppm would appear generally heavier than air (0.038%) – unless the air itself was particularly ‘heavy’ (humid)?
By the way, the device you have pictured as a “SA1200P” is not the actual device model.
It’s manufacturered by someone in china and resold/rebranded under dozens of different names.
It was my first CO2 meter! It’s not bad. But I’m fairly confident it’s not 98% accurate. I suspect it’s a problem of temperature compensation, but I saw mine read 380 once outdoors.