Xiaomi Mi Air Purifier 3H

after less than two weeks started to become noisy even on the lowest settings. The air out of the fan doesn't feel anything like clean air (perhaps once the filter gets dirty it pushed the dirt into the air)
Dust sensor showing random numbers literally.

These might the issues with every air purifier in the market, though. They don't really solve the problem of air pollution.

Worked well for 18 months. Now the app and purifier do not communicate effectively making the machine useless - I mean who wants to have to manually turn off and on. Suspect it may have updated the app itself and that's corrupt or something. Heaps of stuff online about this problem and no fixes. Xiaomi never respond to emails. Buy another brand for goodness sake.

PRO:
* Very reasonably priced.
* This air purifier can be controlled by Smart Phone, even while away from the home using Xiaomi Home App.
* Can be scheduled to turn on and off at certain times of the day
* Gives constant readout of Air Temp, Humidity and Air Quality
* Efficient and affordable HEPA 13 Class Filter lasts a long time and can be changed in less than a minute.
* Gives estimate of amount of days left before Filter will need to be replaced.
* Energy efficient.
* Our experience is that it quietly monitors the air and as soon ...

i heard lots of comments said the sensor is useless, but there is nothing wrong with it.
i got xiaomi air purifier 3, phillips 2000 and an air quality meter they all got simular readings,
the difference is the phillips 2k thought under 30 means that the air quality is good while xiaomi is 50.
some air purifiers want u to use it more often to shorten the life time of the filter, they intended to lower the numbers.
for example the phillips 1000, it will start to think the air is polluted with a reading for 10+.
you could use a none water base air spray to test out c if the sensor works, just spray a little near the sensor, the reading should jump instantly.

Purchased the Xiaomi 3/3H Air purifier with the HEPA filter from Kogan and the purifier was shipped by Gearbite (Melbourne). The purifier does work without pairing to the Xiaomi Home App. Of course, pairing to the App has its benefits but you can just plug the purifier to the power and turn on the device to work.
Product was delivered in 7 days from the date of placing the order and was delivered by express Australia Post. The Xiaomi Purifier comes with a separate electrical cord which can be used in Australia (the plug that has three flat pins...