Hello All,I need a device to measuring PM2.5 levels in the room, however I feel a bit confused the function of DC1100.Can the DC1100 be used to measure the nubmer of fine particles on the size of <2.5 microns??Or the DC1100 will only measure the number of particles on the size of >1 micorons,but < 2.5microns?Which model (standard or pro)is better for this purpose?Thanks a lot! Hello All,I need a device to measuring PM2.5 levels in the room, however I feel a bit confused the function of DC1100.Can the DC1100 be used to measure the nubmer of fine particles on... » Read More Hello All,I need a device to measuring PM2.5 levels in the room, however I feel a bit confused the function of DC1100.Can the DC1100 be used to measure the nubmer of fine particles on the size of <2.5 microns??Or the DC1100 will only measure the number of particles on the size of >1 micorons,but < 2.5microns?Which model (standard or pro)is better for this purpose?Thanks a lot! « Show Less
933447
the 1100 pro does >0.5 microns and >2.5 (both readings) one is on the left side and one on the right side. http://dylosproducts.com/dcproforairp.html or http://dylosproducts.com/ornodcproair.htmlDC1100 Pro has all the features of the standard DC1100 but with increased lower sensitivity - detecting particles down to 0.5 micron. The large particle size range is calibrated to 2.5 microns and above. so the small number shows you .5 to 2.5 and the large is 2.5 and up.
933448
you cannot get a very accurate value in pm 2.5 ,but you can estimate the value of pm2.5 with the reading in the device.for dylos 1100 pro , reading /100 will be close to the value of pm2.5.for dylos 1100 , reading *3% -5% will be close to the value of pm 2.5.
596499
The meter works better when pointed at a specific object to measure it's sound. I have tried it in a room but noticed only small differences in levels when the sound was perceived louder. It runs on batteries and I've always held it so I wouldn't know if you can read it form another angle or distance
1195683
I don't know from personal testing of that feature, but the unit has been accurate for the other things I've used it for. Klein has a good rep for quality for the price. A Simpson 260 analog/digital Multi-Meter like I used in the Navy will do the job too, but at ten times the price. Sorry for the snarky reply, I've just spent (4) hours trying to straighten out my computer. If Klein is not what you need, try Fluke. It's more expensive (about $120.00), but probably closer in accuracy. I guess it's all about how fine you need to measure the resistance. If you're looking for super accurate stuff, there are specialized measuring instruments out there just for that application. I hope this helps. Mike
227857
I run mine in the bedrooms just at night. It knocks down the particulate level to a good air quality level quickly, so if I'm not in the bedroom, I see no reason to run it. I have an air quality monitor to measure that, so it's objective. We have a different brand of air purifier (IQ Air Health Pro Plus) in our main living space, and that one is on a low to medium setting almost all day. I turn it off or way down at night and rev it up to high if we have poor outdoor air quality or if I can see that the air quality in the house is poor via the monitor. Life if much better since I got two of these Honeywells and the IQ Air. I run mine in the bedrooms just at night. It knocks down the particulate level to a good air quality level quickly, so if I'm not in the bedroom, I see no reason to run it. I have an air quality monitor to measure that, so it's objective. We have a different brand of air purifier (IQ Air Health Pro Plus) in our main living space, and that one is on a low to medium setting almost all day. I turn it off or way down at night and rev it up to high if we have poor outdoor air quality or if I can see that the air quality in the house is poor via the monitor. Life if much better since I got two of... » Read More I run mine in the bedrooms just at night. It knocks down the particulate level to a good air quality level quickly, so if I'm not in the bedroom, I see no reason to run it. I have an air quality monitor to measure that, so it's objective. We have a different brand of air purifier (IQ Air Health Pro Plus) in our main living space, and that one is on a low to medium setting almost all day. I turn it off or way down at night and rev it up to high if we have poor outdoor air quality or if I can see that the air quality in the house is poor via the monitor. Life if much better since I got two of these Honeywells and the IQ Air. « Show Less
221305
The other reviewer is correct. You purchased the wrong fan for your application. GOOD NEWS! You can buy another small fan, called a room-to-room fan with a 110/120v plug. There are many different types which are small and inexpensive. Check this out...it has an 11ft cord and only 5" square:Achla Designs Room-to-Room Minuteman Doorway Fan
728106
The GMC-300 is easy to use and low priced as an entry level radiation detector. I use mine to monitor background levels of radiation as I have yet to find an highly active source. Here in central BC, Canada I get 14 to 22 cpm, with a high of 30 cpm. It appears to decrease after a rain fall. The only thing missing with the GMC-300 is a radiation standard but I can understand why.
708047
Not sure what CADR even means. It is a little perturbing that I do not know how to measure the effectiveness of this device. It is in my room and on. It does collect much dust in the filter, but, just how effective it is as compared to what it states it can do, no idea. I wish I knew of a free way or at least a very inexpensive way to check the effectiveness of this device.
670337
Berkey doesn't publish micron ratings as they're a little misleading. From their website, if a filter traps of 0.2 micron particles then it's acceptable - even if the other 10% lets in 1.0 micron particles - to call it a 0.2 micron filter. But if you read the test results on their website, their filters are capable of filtering 99.999% of viruses and 99.9999% of bacteria. That's better than almost any filter out there. In fact, you test the filter by adding a teaspoon of red food coloring to a gallon of water and running it through the filter. I can vouch for the fact that in mine, the water comes out crystal clear.
583167
You must be in Shanghai or another city in China too. My husband's employer's HR department recommended the 3M N95 masks. I am using them and I truly hope that they are effective since the AQI here has been around 500 yesterday. I think PM2.5 hovered at about 300. Wish I could give you a definitive answer. I do notice a difference between when I am wearing a mask and when I forget to put in on.
670336
Berkey doesn't publish micron ratings as they're a little misleading. From their website, if a filter traps of 0.2 micron particles then it's acceptable - even if the other 10% lets in 1.0 micron particles - to call it a 0.2 micron filter. But if you read the test results on their website, their filters are capable of filtering 99.999% of viruses and 99.9999% of bacteria. That's better than almost any filter out there. In fact, you test the filter by adding a teaspoon of red food coloring to a gallon of water and running it through the filter. I can vouch for the fact that in mine, the water comes out crystal clear. Berkey doesn't publish micron ratings as they're a little misleading. From their website, if a filter traps of 0.2 micron particles then it's acceptable - even if the other 10% lets in 1.0 micron particles - to call it a 0.2 micron filter. But if you read the test results on their website, their filters are capable of filtering 99.999% of viruses and 99.9999% of bacteria. That's better than almost any filter out there. In fact, you test the filter by adding a teaspoon of red food coloring to a gallon of water and running it through the filter. I can vouch for the fact that in mine, the... » Read More Berkey doesn't publish micron ratings as they're a little misleading. From their website, if a filter traps of 0.2 micron particles then it's acceptable - even if the other 10% lets in 1.0 micron particles - to call it a 0.2 micron filter. But if you read the test results on their website, their filters are capable of filtering 99.999% of viruses and 99.9999% of bacteria. That's better than almost any filter out there. In fact, you test the filter by adding a teaspoon of red food coloring to a gallon of water and running it through the filter. I can vouch for the fact that in mine, the water comes out crystal clear. « Show Less
1900452
No. This is a fine meter which is more at home in the power distribution area than in the audio and RF signal strength area. Its lowest voltage scales are designed for 1 to 400V for both AC and DC. It's a good meter for its intended use which does not include micro and millivolt volt measurements. Input impedance circuits in meters like this are too low to measure millivolt size signals,
2125605
About the same. This one doesn't filter as small of particles. still good for emergencies!
1418686
If you push the button to check the current level, will it be displayed? I read in a review that responders would not enter the house without respirators when the house read at 30 ppm (with windows open). Sounds like buying cheap is a big gamble.
707654
Yes, mold would be classified as a small particle, the readout counts large and small particles, it will measure them but wouldn't distinguish between mold and other small particles. You might let some dust settle on a glass plate and check with a microscope.
13740
The MERV rating is a standards manufacturers use to compare the efficiency of filters. The higher the rating, the better the efficiency I picked the following information off another site "the following MERV ratings measure filtration efficiency of particles ranging from 0.3 microns and up. With more an more emphasis being placed on micro particles, 3M developed their MPR Micro Particle Rating to measure filtration of even smaller particles, down to .001. Some competitors are beginning to adopt the new standard that 3M developed but there is still predominant use of MERV. As a reference, the 3M Micro furnace filters have a MPR of 1000. Their rough equivalent MERV rating is 13-14. So while their is currently no sure equation way to convert MERV to MPR, if you use the approximate MERV rating of the Micro filter MPR rated at 1000, then the 4" filters MPR rated at 1550 would conceivably exceed MERV 18, which currently puts their filtration in line with the more expensive NordicPure furnace filters. Because 3M uses this different measuring scale and system, it's difficult to do a straight comparison."
1794232
question a bit perplexing while in use? volume of paper? or when not in use? have not timed my unit after using it can you be more specific I have not had any problems with this unit so far dcp is there a specific problem?
534540
I cannot answer about the micron size! this mask with the P100 Toxic dust filters Meets OSHA and NIOSH P100 requirements for scraping lead paint or working near Asbestos , or working around Toxic Mold! Respiratory protection against particulates under the 42 CFR 84 P100 classification (99.97% efficient against all particulate aerosols including oil-based aerosols). For additional information, call MSA Safety Works customer service at 1-888-MSA-HOW2 (1-888-672-4692).