DylosStandard Laser Air Quality Monitor (STD)

Great product, especially given the cost. I've worked in medical device industry for 20+ years where I've used professional particulate counters so I have a fair bit of experience in what to expect. Although this is not in the same league, my testing of this device under various conditions gave me confidence that the relative results were good and that the this counter is doing what it said.I've a couple of treadmills in the garage that get used daily for about an hour. I was concerned that I may be doing more harm on the treadmill if it was an hour each day deeply breathing really dirty air. Thus first to gain trust in the device, I measured air in the house first thing in the morning after everything had been still and later in the day with the dog and all the movement. The same again outside near the ocean and again after rain and middle of day. Then when in the garage when still. Then again over the full cycle of the treadmill use. I found a nice consistent pattern of particulate readings that gave me confidence in the results.For me my still garage was pretty clean but after 10 minutes on the treadmill the air quality became very poor--the worst. I'd put on a large German attic fan 6 months before and found if I ran the fan the entire time the air quality stayed almost the same as the outside air as measured near my head---much cleaner than what I had been exercising in. This answer wasn't obvious to me as I wasn't sure the fan air would just pick up more of the dust in my garage making it worse. Thus this answer was worth the price alone for my and my wife's lung health.Finally both my shop vac and house vacuum cleaner use HEPA filters: as other have stated neither is HEPA certified. I was quite pleased to see that my shop vac really cleans up the air (exhaust air comes out at the lowest cleanest reading) but disappointed to learn that my house vac does not (exhaust comes out way worst than the poorest air level, greater than 100,000 particle per cubic foot of particle 1 micron and greater in size). Ongoing every time I change my shop vac filter, I'll recheck it to make sure I got a good seal on the filter as this seems the most likely area for a working system to subsequently fail, that is I believe the HEPA filter on my bad vacuum works but that air is leaking around all the seals.I don't see this being used frequently for me. But it answers important questions when needed. I plan to store it in a sealed ziplock baggy so it does not collect dust just sitting around.BTW: The company was very proactive post purchase sending me an email offering to help with any question I might have. It seemed genuine. Although I never used it, I had the sense if I needed help they would be easy to reachUpdate: Aug 2020. I've since bought a Dyson Stick Vacuum, V8. Its exhaust comes out pristine (I dislike Dyson products before this) and I bought two room HEPA filter systems. Both really clean up the air, but you would not know it by the Light color change on the front of one unit. Air in the room measures very clean once its been running for half a day but the green, yellow red light stays red the entire time....(either faulty light or set too low).Note particles less than 2.5 micron are the ones that can go deep into your lungs causing damage, thus I only mention the smaller particle readings, not the greater than 5 micron particle readings.

I've had mine for over a year, typically in monitor mode, and it's still working perfectly. I like what this unit does but I really wish it had a better display/UI. It's a pain to scroll through the historical info. I would love to have a persistent bar graph that shows air quality over the last XX time and let me pick the time frame. It also bugs me that the power plugs into the side and not on the bottom or out the back. Unfortunately last I checked there were no other alternatives in this price range that were accurate so I am at least grateful this unit exists.

It worked great for 7 months and then it stopped working. I feel like it was a couple hundred dollars wasted.

This product has been a god-send. I rented a house that has a severe mold problem. The slumlord slapped some paint over the visible mold and did nothing else. With the air quality monitor I have been able not only to quantify the extent of the mold presence in the air (as well as monitor the presence of smoke and dust from the exterior) but also evaluate various strategies for alleviating the problem. So far, the best solution for individual rooms has been to tape a HEPA filter to a fan and place it near the door and blowing into the room. The clean air blowing in soon drives out the micro-particle ladened air.I have no idea about the absolute accuracy of the Dylos Monitor. However, it has been consistently reliable for comparing air quality from room to room and for comparing the effectiveness of various micro particle reduction strategies. I highly recommend it.

I had read god revie s about this product and bought it from Amazon for 199 +. However I am quite out off by the poor quality of the product as it shows very inconsistent readings in a similar setting - sometimes it is 10 times of what it was showing before ??? So overall the readings can't be relied upon.Further, I had no clue that this is not pmi 2.5 but pmi 1.0 ..... nowhere was it highlighted that this is not pmi 2.5...:: which again means it is pretty much useless for me as pmi 2.5 is what is measured where I live.

The Dylos DC1100 works nicely at home. But I also need to check air quality in locations for which 220 volt AC power mains are the standard.The Dylos company did not respond to my question how I can purchase a power supply for 220 volt AC power mains.I did manage to purchase on Amazon an OMNIHIL 220 volt power mains, 1.5 amp output switching power supply, but I worry about the regulation uncertainty of a switching power supply when used in a sensitive application such as this Dylos DC1100. Powered by that switching power supply, is my Dylos device displaying true particulate levels, or are power supply noise spikes being counted, too?I can easily show that the Dylos DC1100 does indeed count power supply noise spikes when used with a random low-quality switching power supply that I happened to find in my house. So I'm stuck with a uncertainty in my air quality measurements.I'd have assigned the Dylos DC1100 five stars if I didn't have the nagging uncertainty.