I believe the PurpleAir is a Plantower PMS5003 (PurpleAir states that they use PMS5003 and PMS1003 sensors).
The Davis looks like it could be a Plantower PMS7003. I’m guessing from shining a flashlight to look at the Davis and comparing to images of the PMS7003). If I guessed right as to the Davis sensor, there is a comparison here: https://aqicn.org/sensor/pms5003-7003/ I don’t know reliable the above source is. I note that two sensors are way off (both are PMS5003 if I got the colors right). > On Oct 2, 2020, at 3:06 PM, Tom Keffer <[email protected]> wrote: > > Amazing how close they are tracking. I wonder what's inside them. Do they use > the same laser sensor? > > On Fri, Oct 2, 2020 at 9:15 AM [email protected] <[email protected]> wrote: >> Earlier, when I posted my AirLink to PurpleAir graphs, I said I would >> follow-up if the air worsened. >> >> The air has worsened, and the graph shows the AirLink very closely following >> the A sensor of the PurpleAir (even more so than the PurpleAir B sensor). >> >> Although one shouldn’t reach conclusions about the AirLink from a couple of >> comparison charts, I am personally skeptical of Davis’ claim: >> >> “ACCURATE: Measures particulates as small as 0.3 micrometers with an >> accuracy of +/-10 micrograms per cubic meter in concentrations.“ >> >> I say this because there are ample studies that show, where air particles >> are dominated by those produced from wood smoke, PurpleAir concentrations >> read about double the true concentration. >> >> Again, I’m not stating Davis got this wrong. I’m just more skeptical of the >> claim than before these observations. >> >> —John >> >> -- >> You received this message because you are subscribed to the Google Groups >> "weewx-user" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/weewx-user/e633ece8-a3f0-4dfd-a58b-63df7abf7886n%40googlegroups.com. > > -- > You received this message because you are subscribed to the Google Groups > "weewx-user" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/weewx-user/CAPq0zEA8wq6RW-E%2BQ1Dd1KoBcxtdpArS%3DfDdLJT5tKa2EWS6sQ%40mail.gmail.com. -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/01B81DAC-99BE-48A4-BFF2-E3E28D7D5C2D%40johnkline.com.
