I came from this other video, ruclips.net/video/APnjhMrJChI/видео.html, which does a teardown of something that looks exactly like the one of the left - the reviewer concluded that the sensors it has cannot possibly detect CO2 levels and called BS. I wonder how many of these sensors are just putting out random numbers.
@@CelestialTrailblazer If buying from scratch/nothing then I would recommend doing a lot more research from multiple places. Maybe find ones which have been tested against scientific / professional grade equipment to check the reported values are the same. If you don't care how accurate they are then the white one with the red numbers is the one I _feel_ most represents what happened in the rooms I had it in.
Great link, thanks for sharing. I opened up my VT-6IN1 that seems similar to the 5IN1. I was wondering if there was a way to access the firmware more easily without hacking, so can calibrate the sensors. I only really paid attention to the PM Detector which appears to be not so good and way off compared to my other PM Detector that uses the laser module PMS5003. I'll watch the video next, as I do more than suspect the sensors are cheap.
I assume, both of your cheap devices do not have a real CO2 sensor build in. A real CO2 sensor costs around 38$ - just for the sensor alone. A common method on cheap devices is to use a simple TVOC sensor, and then they 'predict' the HCHO and CO2 values because of the measured TVOC. But these predicted values are far away from reality. You will not find an air quality monitor with a REAL CO2 sensor for less than 80$. You can check if your device has a real CO2 Sensor, if you open the case, and look for a small metal rectangular box, which includes the sensor. If your device don't have this metal box, it does not have a real CO2 unit included and gives back just some random CO2 values.
What one do you recommend for a air quality monitor that has an actual and accurate voc sensor and hcho and co2 sensors? I’m looking to use it to test different 3D printing filaments and their off gasses and such weather they are safe or not.
The one provided to schools is reading high so they have to change all of the ventilation??? I’m in the US and I would not doubt that to be the case over here. Thanks for the video! I subscribed for more of your stuff! Thanks!
I put a CEM DT-182D (see the photo linked in the video description) outside for about 30 minutes.. brisk windy and cold day.. it read 759. This is the same one which reads 1760 in my office (the location shown in the video).
@@freename Then the CEM-182D is wrong. It has to be calibrated or is just wrong. The thing about most CO2 sensors is that they use a TVOC sensor that calculates CO2 or eCO2. It's a cheap version of measuring CO2. Check out my latest video on my channel where I test my measurement device (NDIR) vs an eCO2 sensor (TVOC). It's in Dutch, but you will get the point by just watching it ;)
@@airvital248 CEM-182D and CEM DT-326 use NDIR sensors type. But they must be "reset" outside at ~400 before use. It is said on the instructions. It's a way of auto calibrate.
I have the small black box but different brand from Chinese manufacturers it seems it is accurate since I have fart on it it can detect CO2 but overall fine particle matter is overacting. The humidity too etc. I’m using this for my project and company use but I believe an industrial compliance model is better.
Better with 24/48 hours calibration, NDIR sensor are good working. The left model CO2 value will be ok after calibration, but HCHO is not good, fake sensor. The right one is best model, value is better than other two models.
Thank god someone else figured this out, ive bought so many and they are all garbage. I made friends with a guy who deals with air quality readings for a living and he came around one weekend and we tested a whole heap vs his calibrated one. None of them are even ClOSe. Tereible. This is the story of cheap chinese garbage.
Why nobody test these chinese air quality monitors with a Temtop 2000 or any other trustable device? It would immediately answer the question instead of many speculations with no true answer in the end.
Thank you for this. I'm sure something is going on in my house - I can barely breathe, it feels as if I'm breathing in smoke, even with the windows open. I got a Xiaomi air purifier, and it thinks everything is fine, so I was looking at air quality metres. But it seems as if given the cost of the sensors, 90% of the meters being sold here in NZ are absolute garbage, and frankly false advertising. They physically can't do what they're claiming they can do. I'm looking now at things like the Zigabee multi-sensor air quality monitors, and wondering - they're pretty cheap, do they just give random numbers too? Or the Airthings Radon + CO2 etc monitor - are they basically just putting out random numbers? Even the Xiaomi air purifier doesn't agree with the humidity and temperature of all my other thermometers I have around the house (which agree with each other) - and that thing cost a fortune. I feel as if the public is being ripped off, and put in danger by these false claims. I think they need to be held accountable.
Have a look through this guy's blog.. he will have done his research and posted about what he trusts in one of the articles. Sorry I can't link a specific one. I've forgotten which one contains the info www.google.com/search?q=revk+air+quality
ReVamp, First I would like to address your symptoms... It may be that you have an excessive amount of ammonia in your house air as that would be what would feel like being suffocated (hard to breath) - just a guess however, and your purifier probably don't detect ammonia and therefore wouldn't show anything wrong. I thoroughly agree with everything you say - especially that these companies need to be held responsible for selling these lie detectors to the public. The video I just uploaded shows a tear-down of one of these fake monitors and looks very close to the black one in this video - It actually utilizes a breathalyzer sensor to give the CO2 readings - Insane. I do have recommendations on monitors that I have tested, and getting ready to do another review/test/tear-down of another air quality monitor around the end of this month. If you are looking for a good monitor right now - the TemTop M10 (I Have tested) is a good monitor. The TemTop C10 CO2 monitor is good as well. The scary thing is that allot of these Chinese companies are now seriously raising the prices on these monitors (I seen a fake monitor the other day that cost more than 60.00), and I think it is to further fool people into thinking these fake monitors are legit because of the high price. In other words... "It has to be legitimate because it is so expensive". These scam devices are getting way out of hand, and people can easily die relying on these for their safety.
this is exact the video I wanted to see, I just bought one of the 15 dollar ones like the 24 money unit one you have. I got it to test my containment for print abs, mine seems to make sense, temps right humidity makes sence. co2 seems high. and idk about the voc and the hcho. the hcho will got up when my oven is on and the tvoc is 15 times high in my printers enclosure than out side, so it might work. (edit I broke mine open and yeah theres only a combination temp humidity sensor and a single unmarked can with 4 leads. rip)
IKEA do a small unit which shows a green yellow or red light. I'd trust that one the most and I think it's lower cost than all the ones I tested in this video!!
Hmmm... I'm sorry but it would be helpful if you're going to make a video you should know all the terms. Also I've watched a few of these and some you have to put outside which will calibrate it.. Everyone else here is a video where the man explains what all the abbreviations are... ruclips.net/video/LxPfk2rluvo/видео.html
The white square one CEM DT-326 is genuinely inaccurate. It doesn't matter where it is used or put when you turn it on; it still reads insane values. Right now its in a room that has been empty since Friday and is reading 1236 PPM. (Have it on webcam, long story, don't ask why).
@@freename Sorry I nicked you but again, most I seen you take out side to calibrate... you also take outside to make sure they go to very low levels as they should.
@@freename But 1236 ppm is not an "insane" reading even in a room empty for several days if it's not ventilated. The air doesn't clean itself up. I'm much more suspicious of the other devices reading 450/500 ppm in what appears to be indoors in the video. Even the 1950 ppm in the video isn't insane after a day or two of having someone inside without cycling the air.
@@jobigoud The room they are in is tiny and badly insulated. The door was immediately to the right of where I was filming and had been opened and closed multiple times throughout the day. See the imgur link in the video description for a photo of the same devices in a different building. The CEM is still reading much higher than the others (but not quite as high as the reading it gives in my office where the youtube video was recorded).
yea go to a store and marvel at ten difrent readings from 10 difrent temprature meters ha i had co2 and carbon meters they wouldnt go off even inside a smokey wood stove just left them in there and leave a window open from now
I'm sorry, and really not trying to make you look bad; but hearing you talk about something you obviously know nothing about is like a dog looking at a wrist watch. Yes, if your point is these are all junk, you have a point. Why not calibrate each of these cheap units and compare them side by side with a certified (9001) unit that is also calibrated? Please do us all a favor and don't do any further demonstrations or testing, unless you have a clue what you are talking about.
I understand and yes, the video is pretty pointless without something I know is accurate. It's conveyed the fact that they are all not really helpful other than indicating that opening windows and airflow often changes the value and demonstrates that the window had an effect. I still feel that those searching for the devices will come out better informed than if the video did not exist. If you'd like to fund a know good air quality meter I'd do another video :D
@@freename I think the point is that these units likely require calibration adjustment. I believe the majority of them will automatically adjust, maybe try leaving it running for a day or two. Many of them will allow you to manually calibrate them. I'd be happy to talk this through with you, this is an area in which I have significant experience
@@devongoldstone9979 I assume as most have few buttons that it is just a case of leaving them on? None of the instructions mention this step (some say you have to leave them around 20 minutes but certainly not days).
Please feel free to make your own video with your accurate knowledge. At least this guy is trying to do something. He's not declaring he is an expert, just showing the range in values on the different units.
@@freename you missed the point. What you've done is your initial opinion of a product but it comes without ANY proof, testing, or actual data from ANY known source. If you don't have the equipment how can you say any one of them are not functional? It's like comparing cars but not being able to start or drive any of them. Then saying one is probably faster because it has racing stripes painted on the side. And then when someone says anything about it you're response is " I did the best I can do with what i have. You can buy me a car and and a dyno to test it on if you want." Why do a video when the only source of facts comes from reaching up your bunghole?
Not point Not Not eight ? What kind of language are you speaking in ? Besides your gut feeling is telling you that one meter is more accurate than the other ? Pointless and misleading review you've uploaded.
I'd say more than a gut feeling. I'm certain the room I filmed in does not have CO2 readings in the thousands. As for the language. British English and having spent a lot of childhood listening to BBC Radio so probably sound "posher" than most? For more information please read: ruclips.net/video/CxHa5KaMBcM/видео.html
I came from this other video, ruclips.net/video/APnjhMrJChI/видео.html, which does a teardown of something that looks exactly like the one of the left - the reviewer concluded that the sensors it has cannot possibly detect CO2 levels and called BS. I wonder how many of these sensors are just putting out random numbers.
Great link, thank you!
@@freename So, which one is the real/legit. I'm looking to buy one.
@@CelestialTrailblazer If buying from scratch/nothing then I would recommend doing a lot more research from multiple places. Maybe find ones which have been tested against scientific / professional grade equipment to check the reported values are the same.
If you don't care how accurate they are then the white one with the red numbers is the one I _feel_ most represents what happened in the rooms I had it in.
Great link, thanks for sharing. I opened up my VT-6IN1 that seems similar to the 5IN1. I was wondering if there was a way to access the firmware more easily without hacking, so can calibrate the sensors. I only really paid attention to the PM Detector which appears to be not so good and way off compared to my other PM Detector that uses the laser module PMS5003. I'll watch the video next, as I do more than suspect the sensors are cheap.
I assume, both of your cheap devices do not have a real CO2 sensor build in.
A real CO2 sensor costs around 38$ - just for the sensor alone.
A common method on cheap devices is to use a simple TVOC sensor, and then they 'predict' the HCHO and CO2 values because of the measured TVOC. But these predicted values are far away from reality.
You will not find an air quality monitor with a REAL CO2 sensor for less than 80$.
You can check if your device has a real CO2 Sensor, if you open the case, and look for a small metal rectangular box, which includes the sensor.
If your device don't have this metal box, it does not have a real CO2 unit included and gives back just some random CO2 values.
What are these “fake” sensors they are using? Is the NDIR sensor the “good” or most accurate type? Thanks.
Answer the damn question.
What one do you recommend for a air quality monitor that has an actual and accurate voc sensor and hcho and co2 sensors? I’m looking to use it to test different 3D printing filaments and their off gasses and such weather they are safe or not.
The one provided to schools is reading high so they have to change all of the ventilation??? I’m in the US and I would not doubt that to be the case over here. Thanks for the video! I subscribed for more of your stuff! Thanks!
The best test for CO2 is to put them outside. The one that's closest to 440PPM is the most accurate.
Good idea. There there are far to many assumptions and opinions in this vid to confidently buy any of these products.
I put a CEM DT-182D (see the photo linked in the video description) outside for about 30 minutes.. brisk windy and cold day.. it read 759. This is the same one which reads 1760 in my office (the location shown in the video).
@@freename Then the CEM-182D is wrong. It has to be calibrated or is just wrong. The thing about most CO2 sensors is that they use a TVOC sensor that calculates CO2 or eCO2. It's a cheap version of measuring CO2. Check out my latest video on my channel where I test my measurement device (NDIR) vs an eCO2 sensor (TVOC). It's in Dutch, but you will get the point by just watching it ;)
@@airvital248 CEM-182D and CEM DT-326 use NDIR sensors type. But they must be "reset" outside at ~400 before use. It is said on the instructions. It's a way of auto calibrate.
@@christianad5358 thank you for this info
I have the small black box but different brand from Chinese manufacturers it seems it is accurate since I have fart on it it can detect CO2 but overall fine particle matter is overacting. The humidity too etc. I’m using this for my project and company use but I believe an industrial compliance model is better.
Amazing 😂
I just bought a new home so I'm looking for a really good HCHO (formaldehyde) detector. Any suggestions?
Better with 24/48 hours calibration, NDIR sensor are good working. The left model CO2 value will be ok after calibration, but HCHO is not good, fake sensor. The right one is best model, value is better than other two models.
Thank god someone else figured this out, ive bought so many and they are all garbage. I made friends with a guy who deals with air quality readings for a living and he came around one weekend and we tested a whole heap vs his calibrated one. None of them are even ClOSe. Tereible. This is the story of cheap chinese garbage.
Why nobody test these chinese air quality monitors with a Temtop 2000 or any other trustable device? It would immediately answer the question instead of many speculations with no true answer in the end.
Because it probably costs hundreds of dollars :( and those interested in testing low cost devices don't have spare to spend,
@@freename hi, I have a Lasair II particle counter, and have a cheap £63 device coming tomorrow, I'll let you know the results I get.
Thank you for this. I'm sure something is going on in my house - I can barely breathe, it feels as if I'm breathing in smoke, even with the windows open. I got a Xiaomi air purifier, and it thinks everything is fine, so I was looking at air quality metres. But it seems as if given the cost of the sensors, 90% of the meters being sold here in NZ are absolute garbage, and frankly false advertising. They physically can't do what they're claiming they can do. I'm looking now at things like the Zigabee multi-sensor air quality monitors, and wondering - they're pretty cheap, do they just give random numbers too? Or the Airthings Radon + CO2 etc monitor - are they basically just putting out random numbers? Even the Xiaomi air purifier doesn't agree with the humidity and temperature of all my other thermometers I have around the house (which agree with each other) - and that thing cost a fortune. I feel as if the public is being ripped off, and put in danger by these false claims. I think they need to be held accountable.
Have a look through this guy's blog.. he will have done his research and posted about what he trusts in one of the articles. Sorry I can't link a specific one. I've forgotten which one contains the info
www.google.com/search?q=revk+air+quality
ReVamp, First I would like to address your symptoms... It may be that you have an excessive amount of ammonia in your house air as that would be what would feel like being suffocated (hard to breath) - just a guess however, and your purifier probably don't detect ammonia and therefore wouldn't show anything wrong. I thoroughly agree with everything you say - especially that these companies need to be held responsible for selling these lie detectors to the public. The video I just uploaded shows a tear-down of one of these fake monitors and looks very close to the black one in this video - It actually utilizes a breathalyzer sensor to give the CO2 readings - Insane. I do have recommendations on monitors that I have tested, and getting ready to do another review/test/tear-down of another air quality monitor around the end of this month. If you are looking for a good monitor right now - the TemTop M10 (I Have tested) is a good monitor. The TemTop C10 CO2 monitor is good as well. The scary thing is that allot of these Chinese companies are now seriously raising the prices on these monitors (I seen a fake monitor the other day that cost more than 60.00), and I think it is to further fool people into thinking these fake monitors are legit because of the high price. In other words... "It has to be legitimate because it is so expensive". These scam devices are getting way out of hand, and people can easily die relying on these for their safety.
this is exact the video I wanted to see, I just bought one of the 15 dollar ones like the 24 money unit one you have. I got it to test my containment for print abs, mine seems to make sense, temps right humidity makes sence. co2 seems high. and idk about the voc and the hcho. the hcho will got up when my oven is on and the tvoc is 15 times high in my printers enclosure than out side, so it might work. (edit I broke mine open and yeah theres only a combination temp humidity sensor and a single unmarked can with 4 leads. rip)
Such a shame
Maybe temperature is too high because you're charging the battery at the same time and sensor is close to battery
The temperature measured could be affected by the heat generated by battery being charged ,
Very true!
NDIR detectors are probably more accurate than TVOC.
i think the middle one is displaying parts per month
can you recommend a good affordable one ?
IKEA do a small unit which shows a green yellow or red light. I'd trust that one the most and I think it's lower cost than all the ones I tested in this video!!
Thanks for this video. Super interesting.
:)
Hmmm... I'm sorry but it would be helpful if you're going to make a video you should know all the terms. Also I've watched a few of these and some you have to put outside which will calibrate it.. Everyone else here is a video where the man explains what all the abbreviations are... ruclips.net/video/LxPfk2rluvo/видео.html
The white square one CEM DT-326 is genuinely inaccurate. It doesn't matter where it is used or put when you turn it on; it still reads insane values. Right now its in a room that has been empty since Friday and is reading 1236 PPM. (Have it on webcam, long story, don't ask why).
@@freename Sorry I nicked you but again, most I seen you take out side to calibrate... you also take outside to make sure they go to very low levels as they should.
@@freename But 1236 ppm is not an "insane" reading even in a room empty for several days if it's not ventilated. The air doesn't clean itself up. I'm much more suspicious of the other devices reading 450/500 ppm in what appears to be indoors in the video. Even the 1950 ppm in the video isn't insane after a day or two of having someone inside without cycling the air.
@@jobigoud The room they are in is tiny and badly insulated. The door was immediately to the right of where I was filming and had been opened and closed multiple times throughout the day. See the imgur link in the video description for a photo of the same devices in a different building. The CEM is still reading much higher than the others (but not quite as high as the reading it gives in my office where the youtube video was recorded).
yea go to a store and marvel at ten difrent readings from 10 difrent temprature meters ha
i had co2 and carbon meters they wouldnt go off even inside a smokey wood stove just left them in there and leave a window open from now
I'm sorry, and really not trying to make you look bad; but hearing you talk about something you obviously know nothing about is like a dog looking at a wrist watch. Yes, if your point is these are all junk, you have a point. Why not calibrate each of these cheap units and compare them side by side with a certified (9001) unit that is also calibrated? Please do us all a favor and don't do any further demonstrations or testing, unless you have a clue what you are talking about.
I understand and yes, the video is pretty pointless without something I know is accurate. It's conveyed the fact that they are all not really helpful other than indicating that opening windows and airflow often changes the value and demonstrates that the window had an effect. I still feel that those searching for the devices will come out better informed than if the video did not exist. If you'd like to fund a know good air quality meter I'd do another video :D
@@freename I think the point is that these units likely require calibration adjustment. I believe the majority of them will automatically adjust, maybe try leaving it running for a day or two. Many of them will allow you to manually calibrate them. I'd be happy to talk this through with you, this is an area in which I have significant experience
@@devongoldstone9979 I assume as most have few buttons that it is just a case of leaving them on? None of the instructions mention this step (some say you have to leave them around 20 minutes but certainly not days).
Please feel free to make your own video with your accurate knowledge. At least this guy is trying to do something. He's not declaring he is an expert, just showing the range in values on the different units.
I appreciated the video. More details would have been great, but I appreciated it none the less
Hasnt taken the trouble to check the eqyipment before making a presentation to us. The result being hes coming over as a complete mess
I can only test with what I have. You are welcome to buy me a known good air quality meter to test against:)
@@freename you missed the point. What you've done is your initial opinion of a product but it comes without ANY proof, testing, or actual data from ANY known source. If you don't have the equipment how can you say any one of them are not functional? It's like comparing cars but not being able to start or drive any of them. Then saying one is probably faster because it has racing stripes painted on the side. And then when someone says anything about it you're response is " I did the best I can do with what i have. You can buy me a car and and a dyno to test it on if you want." Why do a video when the only source of facts comes from reaching up your bunghole?
Not point Not Not eight ? What kind of language are you speaking in ? Besides your gut feeling is telling you that one meter is more accurate than the other ? Pointless and misleading review you've uploaded.
I'd say more than a gut feeling. I'm certain the room I filmed in does not have CO2 readings in the thousands. As for the language. British English and having spent a lot of childhood listening to BBC Radio so probably sound "posher" than most?
For more information please read: ruclips.net/video/CxHa5KaMBcM/видео.html