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Temtop · Temtop Professional Handheld Particle Counter, Pump Suction Air Meter
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A handheld particle counter that draws its sample through a pump rather than relying on drift, reporting counts at 0.3, 0.5 and 1.0 micron plus PM2.5, PM10 and TSP indices, with temperature and humidity sensors, a 3500 mAh battery rated for over four hours and 32 GB of internal storage transferred over USB. The pump and the 0.3 micron channel are real advantages over a consumer monitor. The decision rests on a figure the listing never prints: the sample flow rate, without which no count can be tied to a limit.
Pump suction is the difference, and it is the right one
The phrase in the product name is doing more work than it looks. Pump suction is the line between two quite different classes of instrument.
A consumer air quality monitor has a laser, a photodetector and a small fan or simple convection moving room air past the beam. Particles that happen to pass through the beam scatter light, the detector sees the flashes, and firmware estimates a concentration. It is a sampling of opportunity.
A particle counter uses a pump to pull air through an optical cell at a controlled rate. Because the rate is controlled, the instrument knows how much air it has looked at, and that is what turns scattered light into counts per volume by size channel. The whole discipline of particle counting rests on knowing the denominator.
So the pump is not a convenience feature here. It is the mechanism that makes the readings a measurement rather than an estimate, and paying for it is the right call if you need numbers that mean something repeatable. Our background piece on comparing laser particle sensors covers how the optics behave in both arrangements.
A count is only a number if you know the volume it came from
Here is the problem. Having built the instrument around a controlled sample volume, the listing does not state what that volume is.
Counters in this field are commonly built around one of a small number of conventional flow rates, and the figure matters in two ways. It sets how long you have to sample to collect a statistically meaningful count at low concentrations, and it sets the denominator every reported figure is divided by. A low flow instrument needs a longer sample in clean air before the number settles; a high flow instrument reaches a stable figure sooner.
Neither flow rate nor sample time appears anywhere in the five bullets. Nor does a counting efficiency figure, which is the proportion of particles of a given size that the optics actually register, and which is the reason two counters pointed at the same air can disagree.
The practical consequence is narrow but important. You can use this instrument to show that the count went down after a filter change, up after sweeping, or higher in one room than another, and all of that is useful. What you cannot do is state a concentration against a limit someone else will check, because the chain from flash to count per cubic metre has an unpublished link in it.
Three channels stop where the classification standards start
The channel set is 0.3, 0.5 and 1.0 micron. Two observations about that.
The first is positive and specific. A 0.3 micron channel looks at airborne particles in the size band that fibrous filters find hardest to capture, which is why high efficiency filter ratings are defined around there. If you are checking whether a filter is doing its job, or whether a housing is leaking around the filter rather than through it, that is the channel you want. Many cheaper instruments start at 0.5 micron and cannot see it.
The second is a limit. Classification schemes for clean environments define concentration limits at a series of named sizes, and the coarser classes are set by the count at 5.0 micron. There is no 5.0 micron channel here, so those classes simply cannot be evaluated. For a buyer who needs a classification report rather than a trend, this instrument is not the one.
Between those two points sits a practical tool. Three channels is enough to see whether a change in the air is mostly fine particles or mostly coarse ones, which is usually the question that decides what to do next. Our roundup of handheld particle counters for filter testing sets out what the channel sets look like elsewhere.
TSP from an instrument that stops at one micron
The first bullet lists PM2.5, PM10 and TSP alongside the three count channels, and this is where the specification quietly contradicts itself.
TSP means total suspended particulate: everything the air is carrying, including grit and fibres tens of microns across. PM10 means everything up to ten microns. The largest channel this instrument publishes is 1.0 micron.
Mass is dominated by the big particles. Volume rises with the cube of diameter, so one ten micron particle carries roughly a thousand times the mass of one micron particle of the same material. An instrument that does not resolve above 1.0 micron is therefore blind to almost all of the mass that TSP is supposed to describe, and most of what PM10 describes.
That does not mean the figures are useless, but it does tell you what they are: a conversion from the counts the instrument can see, scaled by assumptions about what is probably in the air alongside them. Reported as indices for comparison they are fine. Treated as mass concentrations against a guideline, they are a calculation rather than a measurement. Our note on comparing PM1, PM2.5 and PM10 readings explains why the mass split behaves this way.
Published figures, and the gaps a counter cannot afford
| Specification | Published in the listing |
|---|---|
| Count channels | 0.3 micron, 0.5 micron, 1.0 micron |
| Mass indices | PM2.5, PM10, TSP |
| Sampling method | Pump suction |
| Additional sensors | Temperature and humidity |
| Internal storage | 32 GB, USB data transfer |
| Battery | 3500 mAh, continuous operation exceeding 4 hours |
| Sample flow rate | Not stated in the listing bullets |
| Sample time per reading | Not stated in the listing bullets |
| Counting efficiency | Not stated in the listing bullets |
| Accuracy, counts or mass | Not stated in the listing bullets |
| Channel above 1.0 micron | Not stated in the listing bullets |
| Logging interval and file format | Not stated in the listing bullets |
| Calibration interval | Not stated in the listing bullets |
Two rows deserve comment in opposite directions.
The 32 GB of internal storage with USB transfer is the best designed part of this instrument, and the reason is independence. Thirty two gigabytes is far more than logged readings will ever fill, and a USB connection means the records come off onto a computer without an account, an app or a pairing step. A logger whose data you can only reach through a vendor application is a logger that stops being useful when the application does. This one will not have that problem.
The accuracy row is the one that stings, because the first bullet uses the words reliable and accurate without putting a figure behind either. On a counting instrument the credible form of that claim is a counting efficiency at a stated size, and it is absent.
The buyer this suits, and the report it cannot produce
Buy this if your question is comparative. Is the air in this room worse than that room. Did the count fall after the filter was changed. Is the fine fraction rising while work is going on. For all of those a pumped three channel counter with onboard storage and a real battery is a substantial step up from a consumer monitor, and the 0.3 micron channel makes it genuinely useful around filtration.
Do not buy it if someone else has to accept the numbers. A classification needs the 5.0 micron count, and any concentration figure needs a published flow rate and counting efficiency behind it. Neither is on this page. If you want to establish a baseline you can defend later, get the flow rate in writing from the maker before the instrument goes to work, and record it alongside your readings so the counts stay interpretable.
Recommended Tools
Products shown because their documented specifications fit this guide. Price and availability are on Amazon and can change.
Frequently Asked Questions
What is a sample flow rate and why does it decide everything?
It is the volume of air the pump pulls through the optical cell in a given time, and every count a particle counter reports is a count per unit volume. Multiply the flow rate by the sample time and you have the volume the counter looked at. Without that figure a reading of several thousand counts is a number with no units behind it, because you cannot tell whether the instrument sampled a litre or a hundred millilitres to find them. This is the one specification a counting instrument cannot leave out, and these five bullets leave it out.
Does it have the channels needed for a cleanroom classification?
Not on its own. Cleanroom classification is defined by concentration limits at specific particle sizes, and the coarser classes are set by a limit at 5.0 micron. The published channels here stop at 1.0 micron, so the count that defines those classes is not available at all. The three channels it does have are a reasonable set for watching a filter or a process, but a classification report needs the sizes the standard names and the sample volume behind each count.
Why does the 0.3 micron channel matter for filter work?
Because filter efficiency is not a straight line against particle size. Very large particles are easy to intercept and very small ones are caught by diffusion, while the hardest size for a fibrous filter to capture sits in a band around a few tenths of a micron. That is why high efficiency filters are rated at a particle size in that region. A channel at 0.3 micron therefore looks at the filter where it is weakest, which is the useful place to look. Having that channel is the strongest thing on this specification sheet.
Why would a 3500 mAh battery only give four hours?
Because a pump is a motor, and a motor is a much heavier load than a sensor. A diffusion based air monitor on the same cell would run for days, since all it powers is a laser, a small fan and a screen. Here the cell has to turn a pump continuously to keep the sample volume moving. Over four hours from 3500 mAh is a reasonable return for a pumped instrument rather than a disappointing one, and it explains why the listing pairs the two figures in the same bullet.
Is a particle count better than a PM2.5 reading?
It is a different measurement, not automatically a better one. A count tells you how many particles of a given size passed through the cell. A mass concentration in micrograms per cubic metre tells you how much material was in the air, and guideline levels for health are written in mass. Converting counts into mass means assuming a density and a shape for particles you cannot see, so the mass figure from a counting instrument carries that assumption inside it. Use the counts for comparing before and after, and treat the mass indices as indicative.
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