Air Quality Tester, Detector, Multi-Functional Formaldehyde (HCHO) / PM2.5 / PM10 / TVOC Monitor, Suitable For Indoor, Outdoor, Vehicle And Other Environmental Air Detection BY FUELUS(English version)

It's works great, BUT..... It would have been great if they had included clear instructions, written by someone who actually speaks English fluently. The directions were so poor I wasn't even using it correctly for several days. It was so vague and unclear, very confusing, as though it was written by someone who had a very limited understanding of how to speak English. Because of the poor instructions I had it programmed improperly for several days. I thought my air was horrible, my friend's house also. Then I tried reprogramming it again, still no success. Another day I started playing with it trying different things and on a hunch I tried something based on a guess that maybe what it sounded like they were trying to say meant something totally different, and I got lucky! Confused? I sure was. But once I finally figured out how to program it, it gave me all new readings. A 12 year old could have explained how to set it up better than their very vague attempt at instruction. Which was pretty lame!! But, it works really well once you stumble onto getting it set properly. It does seem to be very sensitive. If they get a more qualified person to write more sensible instructions, I would give it 5 stars easily.

First review ever. This is a garbage. Only give you the number randomly. This product band in China already for non accuracy .I can’t believe amazon still allowing them to sell this. Other lesson from amazon. When you buy from amazon most of they are item not been inspected for sale in the market .

Easy setup, easy reading, it does what it claims. It gives us a peace of mind for each room we stay. And we can see the significant effect when we open the windows even for 10 minutes.

The Catureiss is priced at the right point for a unit of this kind. The instructins indicated it should charge for 4 hours first. I found that charging go quickly and indicates it is recharged each time in much less time. However, the charge completely drains in a very short period of use. The screen can be set to power off after 10 to 120 min but this unit did not hold a charge long enough to last 120 min.The unit is comfortable to hold but operationally, should be left to sit and monitor (10 - 120 min) . Given the battery issues, the way to do that is leave it plugged into a charger via USB. It is really nice that the unit can be run plugged in, for up to 120 min. The base not being very wide, designed for holding in the hand, makes it a bit wobbly to stand alone.The unit produces very precise measurements (three decimal places) but accuracy is questionable. It didn not match values from a competing unit. The numbers also varied - a lot - as much as over 500% under nominal conditions. Specifically, I am speaking of HCHO and tVOC readings. Both PM2.5 and PM10 read as zero (000) on this unit.

BE AWARE OF LEGIT REVIEWS MOST OF THEM ARE FAKE ACCOUNTS CREATED BY THE SELLER. Product seems to work, i go closer to a busy street and numbers increase i go indoors where i know air is fresh and the numbers decrease. be aware this product is in Chinnese, it comes with a english manual so it takes time to get use to it. However operating it is easy once u know the meaning of each menu item.

I thought I'd give these a go, but I don't trust relatively cheap devices like this, so I bought two. After multiple calibrations outside, they're both crazy high, and one is 4x higher than the other one. The $130 one-time test showed only a fraction of what these are showing.

it's every easy to use

I bought 2 Air Testers for my new home, this one is better, but still looks cheap and not accurate at all. The reading digits changes nearly 50% while using or disconnect from external power, and the internal battery lasts very short. The calibration function is actually not a calibration, it just reset all digits to 0 with current circumstance, I have just realized recently. However, I have no choice but relying on this poor tester. I don't know whether the other testers can be better.