Temtop air quality monitors are on sale at Amazon.com. I've been pricing air quality monitors recently. I haven't found a better deal for a name-brand monitor that supports measuring both PM2.5 and CO2.
The P1000 (black) monitor is $20 with free shipping:
https://www.amazon.com/gp/product/B07DHZ3MFR
CamelCamelCamel shows the price was around $100 last year, and dropped this year to a low of $20
The P20C (white) monitor is $40 with free shipping:
https://www.amazon.com/gp/product/B08D94HT83 OOS
CamelCamelCamel shows the price reached a low of $30 late last year, but otherwise was priced from $70 to $140.
P20C vs. P1000
I bought the P20C even though it costs $20 more for the following reasons:
- It supports exporting data to a computer in CSV format
- It supports calibrating the CO2 sensor. The P1000 manual doesn't mention this feature.
- The Temtop website shows sensor accuracy data for this model
- Faster shipping (for my location at least)
The Temtop website shows specs for each monitor:
I was tempted to get the P1000, because it supports monitoring PM10 particles. However, from what I've read, monitors at this price point have one sensor that is calibrated to measure PM2.5 particles. The PM10 measurement simply multiplies the PM2.5 measurement by some factor. So, the PM2.5 and PM10 measurements usually correlate.
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Moreover, the relationship among the PM1–PM2.5–PM10 readings obtained with the PMS5003 appeared improbably linear regarding the natural indoor conditions. The correlation of PM concentrations obtained with the PMS5003 suggests an oversimplified calculation method of PM.
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Source:
https://www.mdpi.com/1424-8220/20/24/7290
Other monitors that I considered:
Both are more expensive, and I wanted to invest as little as possible since I don't know how useful monitoring my air will be.
Some reviews of the QingPing indicate bad quality software and hardware. I also don't like how it sends data to a Chinese cloud service. I like how the Temtops keep data local.
The AirGradient looks very nice, but it's relatively expensive and requires more setup.
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https://www.kickstarter
https://forum.airgradie
I'm guessing that's the reason for the price drop. Read the critical reviews for this inaccurate no-name crap: https://www.amazon.com/Temtop-Tem...geNumber=
I'm guessing that's the reason for the price drop. Read the critical reviews for this inaccurate no-name crap: https://www.amazon.com/Temtop-Tem...geNumber=
All consumer grade monitors seem to use very similar underlying sensors so I think these models are good value.
It's reassuring that the accuracy of the P20C model's sensors are published:
CO2 Accuracy: ±40ppm±readings*3%
The following recent article on hacker news has more good information about air quality monitors: https://news.ycombinato
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For the price I should probably just order one of these and see how it compares - maybe return the aranet4 if it's good enough.
edit: NVM deal's dead for me already. shows $69 for black.
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From their marketing:
...
Temtop has over one million users worldwide and has been a reliable choice for many organizations, including the University of Washington, the University of Chicago, and U.S. government agencies.
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