Indoor 5-in-1 Air Quality Monitor,CO2 Carbon Dioxide Detector,CO2 Monitor, pm2.5 pm10 pm1.0 Detector, Meter,Temperature and Humidity,for Grow Tents,Homes,Cars,Farm etc

I made a video regarding that premieres this evening at 5pm EST. Compares great to my other temperature and humidity sensors both electronics and mechanical analog. However, I can't say without a doubt in regards to the PM values since I don't have a standard reference material and method to compare with. Though my guess is works great and definitely without a doubt compared to another Air Quality Detector that was the ~$23 version VT-6IN1 model. I think for the price and the quality of parts and time saved to make, worth the ~$50 investment. jafinch78 Youtube channel for more videos and this was not a free device sent to me or a paid review.

Model "A1C-PM2.5+AQI+UPLOAD"When the wildfire smoke from Canada came down this summer 2023, this unit outside matched the AQI of about 150 from the AirNow dot gov site +/- 5%. The overall AQI is nice, but I really like that it includes the counts for six particle sizes on one screen. It responds to powdered drink mix, airing out my bedroom sheets and sweeping hard floors. The count of the smallest particles goes nuts--into five digits--when I fry (burn) eggs in butter. Nothing else comes close.I run an oversized HEPA filter in my room to clear allergens. When I open the door to the outside air, values rise. After I close the door, numbers drop as the filter clears the air. Sometimes I feel uncomfortable and look over to see that the AQI went over 50 (not "Good") for some reason.The humidity is significantly different from a TRIPLETT RHT313 electronic thermometer/hygrometer I have. Not sure which unit is accurate. This one has a fan drawing air towards the unit. Temperature seems reasonable.There's a screen with date and time of day that's always wrong. There's supposed to be software to set this and download data, but I haven't tracked it down. Honestly, for these fun little products, it would be best if the manufacturer just published the communications protocol because anyone could write a little script and give it away on the internet for anyone to find. Remember Hayes modems? If we could control those, we can surely communicate with this in 2023.Love it.

So I bought the 5-1 (CO2 version) and the regular HOTKREM, and was able to compare them both.First off, I like the "open" design. It allows air to move in and around freely.Unfortunately, the CO2 meter was off. Always showed lower readings, by about 75-100ppm. It's in the ballpark, but I want a bit more accuracy.The Temperature and humidity was also way off (on both devices) Strange, considering the sensor is right at the top of the unit.What really shines for both units together is the PM2.5 counter. It's quite good. I like the layout of the standard unit over the 5-1, but they both were within a few PPM of each other.I like the fact you get to see (in real time) whats in your air, from .3 microns all the way up to 10 microns.I don't bother with the Temperature of humidity readings, as they are not accurate, so I leave on the PM2.5 meter on the screen.Speaking of screen, very nice display. Easy to read.Cute little buggers, but I'd forget the 5 in1 and just get the standard one for it's cool PM2.5 meter..It does not have any battery's, so it will need to be plugged in all the time, via a common 5v USB connection.I'm giving this one a 3 stars for the excellent PM2.5 counter.

Price to performance is quite hard to beat, It got name brand sensors just like the rest of the air quality monitors.CO2 sensors can be tested by having it outside and seeing if it hits around 400ppm and blowing onto the sensor until it hits 3000ish and stops climbing. I tested mine, indoors with windows open it was around 580 and blowing on it, it hit 3160 and stop climbing.Temps and humidity is ballpark like 1-5% ish compared to my traceable thermometer/hydrometer.Not sure whether the particle meter part is accurate as I got nothing to measure it to.

Not sure why the more expensive version does NOT have PM10, but that's a fact. The PM2.5 monitor, the AQI monitor and the bottom color bars (formaldehyde?) stopped working within 2 weeks. I'm sending this back. $65 for a malfuntioning monitor is NOT something I am willing to abide. The documentation explains very little (example: the color bars at the bottom signify what exactly? assume it is formadehyde but no explanation given.) This monitor also requrires a constant power supply. It cannot be unplugged or it goes off. No battery backup whatsoever. I can only assume this monitor was accurate before AQI & PM2.5 (and the bottom color bar whatever it was) died. I can only assume the other monitors that appear to continue working are in fact still working correctly, but this is unknown. Worthless product. DO NOT BUY!