It came packaged really well and the instructions were clear.
Unfortunately I didn't get a chance to use it.

It was exactly as advertised. A few simple setup steps and the product was ready to use. We were surprised to find out the quality of air in some spaces we were living in and it helped us to improve them.

This Temtop formaldehyde reader that I purchased on Amazon for around $160.00 has been a life saver for me! It is an invaluable tool in helping me recover my health.

I am very sensitive to mold and formaldehyde. We are building a new home, and this reader has been indispensable in helping me identify, avoid or otherwise deal with the many toxic materials that are used in building and furnishing houses today (especially framing, osb sheathing, insulation, drywall compound, paint, Formica counters).

I really do trust the numbers on his meter. It shows consistent results in different places. It shows repeatable high levels where I get my usual formaldehyde symptoms, and low levels where I feel fine. It's always very low (.02 or right around there) outside. The readings are in mg, but from the info I found online, I believe it is basically equal to ppm.

This meter is also helping me to prevent illness and migraines by identifying formaldehyde exposure from myriad products and textiles that I am exposed to on a daily basis. I just started testing everything and learned today that my supposedly healthy dish soap is high in formaldehyde, even though it says on its website that it has no formaldehyde! One of my storage totes that has a strong odor when I open it and it is also high in formaldehyde. I was getting a migraine today and discovered that my room gets high in formaldehyde at different times, for reasons I don't know yet. But thanks to this meter I have the power to figure out why, or at least mitigate the health impact for now by turning on an exhaust fan and opening a window. Knowledge is power. I will be using this meter to help me pick out non toxic furnishings like couches, mattresses, and even kitchen cabinets and counters.

I don't believe all formaldehyde readers are accurate. I bought a $40 formaldehyde meter before this one, and the numbers are confusing and not comparable to this meter at all. This meter turns to green to orange and from healthy to unhealthy when levels get over .1 mg. So it's very clear when levels are high right from the beginning without much of a learning curve.

This meter can also take a beating. It has been dropped a few times, and it recovers fine, though it was affected for hours one time.

I have not tested the accuracy of the particle counter feature yet.

The first few days I had this monitor I really doubted it's readings. I also bought a purifier at the same time. I'd put the purifier in our 80 square foot office and turn it on high for an hour. The monitor registered 0.4 for the pm2.5. I didn't think it was possible. After a little research I learned that trees absorb particulate matter. I then started comparing the pm2.5 levels via the weather channel. I live in the prairie region in SW Minnesota which has a lack of trees. When the outside pm2.5 showed 3 for this area it showed about 1.5 for northern MN which has a few forests in the area and I then checked for Grand Marais, MN which is near the Canadian border and more forest than anything and the pm2.5 registered just 0.41. That shows me that the levels can be that low. I've also been noting the change in the readings overnight when the purifier is not on in the main living quarters. I make sure to get the reading down to 1 or less before I retire for the night. If the pm2.5 according to the weather channel is under 5 outdoors, my indoor reading will be just a little over f1. If it's over 7 outdoors it may be over 3 indoors and if it's as high as 20 outdoors it might be over 5 indoors. If that happens, I'll set the purifier on high until the monitor registers as low as 1. Note that the monitor will need to be on for around 15 minutes to show an accurate reading. The reason I need the low levels is due to sinus issues and my nasal passages being extremely narrow and according to an ENT, it takes very little to plug them. It seems like anything under 2 for the pm2.5 is good for me. It took me literally decades to figure out what the main culprit in the air was.

Take note though that odors and vapor can give this monitor false readings. I had it in the car the other day and it eventually showed around 14. While watching it the reading jumped to over 200., then 500 and then hit 999.99. I figured it was defective. I eventually figured out it was the vapor from my electronic cigarette setting it off. I then heated a pan of water until it started steaming and held the monitor in the steam for just a few seconds and it registered 999.9. There is no particulate matter in water vapor so I consider this a false reading. A couple nights ago I had it on our dining room table and what should have been a 1 was suddenly up to 8. The culprit that time was evidently an onion left on the table. I haven't paid much attention to the pm10 or formaldehyde readings since they're not what I'm concerned with. Due to this monitor and the purifier, my life is improving. I also wear an M90 pm2.5 mask when outdoors and where nobody can see me. 😉

As of mid March I no longer need to use nasal spray, due to keeping the pm2.5 levels low. I just recently started paying attention to the formaldehyde levels. Outdoors this monitor reads .02, which is about where they should be outside. Indoors it was reading around .09, which according to this monitor is unsafe. After much research, I have found that according to the EPA and other abbreviated organizations, under .1 is considered good and .1 - .3 is moderate. However, their measurements are at parts per million and this monitor uses a different type of measurement which is called mg/m3. To convert you take the ppm times 1.25 so if the recommendations are at lower than .1, you'll be safe at under .125 mg/m3. So if this monitor shows it unsafe at .09, don't get excited. I'm guessing this monitor is actually reading ppm and not mg/m3. One more thing, if you can't figure out what might be causing higher formaldehyde levels in your home, the laundry detergent may have a lot to do with it. Every time my wife walked past the monitor when it was on, the reading would jump. After doing a lot of experimenting we figured out it was when she was wearing freshly laundered clothes. We tried a different detergent and the reading were much lower after testing next to clothes just washed. If the readings are high in the house, open a couple windows for a 1/4 hour or so and that will force the cleaner air in and the formaldehyde out. However, I don't always believe the readings. My wife is baking cookies right now and the readings jumped from .09 to .19 within minutes. Yep, I'm basically retired so I have a lot of time to test these things and do research. All in all, I firmly believe that this monitor will help lead to a healthier life.

After reading the instructions, I found this was easy to use. I reviewed all of the one star evaluation's, and there is always one person or a few more who is always reading these as an accurate. I'm not worried about such rarities. I did learned that you cannot leave it on overnight for a history of your air quality. My main concern was volatile organic compounds, and I reached a conclusion that's the HEPA filter on my current air filters was probably in accurate. I am no longer worrying about air quality. I understand that the best way to clean air in your house is by opening a door or window, depending on your neighborhood.