Review on Dylos DC1100 Pro Quality Monitor: Reliable Air Quality Monitoring for Optimal Performance by Brian Page

I bought this machine based on reviews and learned about some of its limitations beforehand (from other air quality blogs/sites). Some important points to keep in mind: - Measures all types of particles, including water particles. Showering, boiling water, cooking, etc. increase the amount of particles. - No VOC gas detector (like some others on the market. Ideally a built in particle counter with a VOC gas detector) - No smart app or any way to upload data (unless you spend a lot more money on a very outdated PC interface) - by cable. Means that measurements in your house require constant plugging and unplugging or a very long extension cord. The device does not support 220-240V if you live outside the USA. Major Cons: - A small wired computer fan drives all units. Revolution. If for some reason the fan stops working (as in my case after 1.5 years), you are left with an unusual machine. I doubt a cheap computer fan is stable/reliable enough to even be used for this application. I'm not sure if the specs of these fans are tight enough to reliably deliver the same airflow (i.e. owners of the same model compare readings) and especially over time. When the fan spins slower, less air is blown through the device, which inevitably affects the readings. The device cannot adjust the fan speed, and searching for a fan OEM does not reveal the fan's ability to lock to a specific fan speed. If you receive a device with a defective/slow fan, just assume your air is cleaner than it really is.- Readings are arbitrary and do not reflect standard values. There are many posts on the web where people have tried to convert metrics to API/AQI, but shouldn't we just work on it? See also the data inconsistency point above - maybe they couldn't detect a constant airflow between devices, making it difficult to apply the standard conversion logic? With that in mind, the most disappointing thing is how unreliable the device is. This explains why they only offer a 90 day guarantee! My car's fan started making noise on startup/shutdown after 8 months and finally stopped working completely after 18 months. I emailed support and they replied that I need to send it back to them (at my expense), I need to pay the repair cost (about $45) and pay shipping back to me. No offer to send me a replacement fan and I understand why (with poorly wired fan design). How much harder is it to plug in a plug-in fan (like any other computer fan)? I think I'm stuck, look for my own fan and plug it back into the board myself. On the other hand, I can confirm that (when it's working) it reports particles moving up and down depending on the environment, and also provides near real-time feedback. The interval sampling mode (when it's running) is pretty useful too, so the fan doesn't have to run 24/7 (which I'm pretty sure it's not designed for).