Radical TechMart - Blog #PM10 dust monitor

Temtop M2000 vs LKC 1000S+ | Air Quality Monitor Comparison

Tue, 20 Oct 2026 05:45:15 +0000

Which Air Quality Monitor Should You Choose? Temtop M2000 vs LKC 1000S Plus

An HVAC engineer walks into a conference room where employees regularly complain about stuffy air. The room temperature is comfortable, the air conditioning is running, and there is no visible dust. Yet something about the indoor environment is not right.

In another building, a facility manager is inspecting a newly renovated office. There are new partitions, painted walls, laminated furniture and adhesive materials. Here, the concern is not necessarily ventilation alone. The manager wants to investigate possible chemical emissions and particulate pollution.

Both situations call for indoor air quality monitoring, but they do not call for exactly the same measurements.

This is where the comparison between the Temtop M2000 and Temtop LKC 1000S Plus becomes important.

Both handheld instruments measure particulate matter and several indoor environmental parameters. However, the M2000 is particularly relevant when carbon dioxide monitoring is required, while the LKC 1000S Plus adds total volatile organic compound monitoring.

Choosing correctly depends on whether your investigation is primarily about ventilation, particulate pollution, chemical emissions or a combination of these conditions.

Temtop M2000 vs LKC 1000S Plus: Quick Comparison

Measurement or feature	Temtop M2000	Temtop LKC 1000S Plus
Primary selection advantage	CO2 measurement	TVOC measurement
PM2.5	Yes	Yes
PM10	Yes	Yes
Particle number indication	Yes	Yes
CO2	Yes	No
HCHO (formaldehyde)	Yes	Yes
TVOC	No	Yes
AQI indication	Not specified in the manufacturer comparison	Yes
Temperature	Yes	Yes
Relative humidity	Yes	Yes
Trend histogram	Yes	Yes
Audible alarm	Yes	Not listed
Rechargeable battery	Yes	Yes
Data export	Second generation	Second generation
Typical application	HVAC and ventilation investigations	Indoor chemical pollution and IAQ surveys

Model variation matters: Temtop sells original and second-generation versions. Radical TechMart lists the M2000 2nd Generation and LKC 1000S Plus product family. Functions such as USB data export must be confirmed against the exact model supplied.

Why CO2 and TVOC Measurements Are Not Interchangeable

A common purchasing mistake is to assume that every multiparameter air quality monitor identifies the same pollution problems.

It does not.

CO2 and TVOC tell an engineer different things about indoor conditions.

CO2 (carbon dioxide) is often used to investigate ventilation conditions in occupied rooms. When people occupy a meeting room, classroom or office, indoor CO2 can rise if the outdoor air supply is insufficient relative to the number of occupants.

An indoor CO2 reading therefore provides useful information for assessing occupancy-related ventilation conditions. However, it does not directly measure fresh air delivery or identify all indoor pollutants.

TVOC (total volatile organic compounds) indicates a combined response to volatile organic compounds present in the air. Potential contributors include paints, adhesives, furniture materials, cleaning chemicals and other indoor products.

A TVOC reading can help identify changes or possible chemical emission concerns, but it does not reveal the exact compound or its individual concentration.

This distinction explains the main selection decision.

Choose the M2000 when CO2 is essential. Choose the LKC 1000S Plus when TVOC is essential.

Both instruments also provide other measurements that support a broader indoor air quality investigation.

Temtop M2000: A Better Fit for Ventilation and CO2 Investigations

Consider an office where the meeting room feels uncomfortable by late afternoon. Before blaming the air conditioner, the facility team wants to see whether CO2 rises as more people occupy the space and falls when ventilation improves.

This is where the Temtop M2000 is a sensible instrument to consider. Its CO2 measurement is the key difference from the LKC 1000S Plus. The second-generation M2000 uses an NDIR CO2 sensor, alongside optical particle sensing and other indoor environmental sensors.

Best for: HVAC engineers, building facility teams and IAQ consultants investigating occupancy-related ventilation conditions alongside dust and formaldehyde.

Why this model makes sense: A CO2 trend gives engineers another diagnostic variable when examining occupied spaces. PM2.5 and PM10 readings help distinguish particle pollution from ventilation complaints. Temperature and relative humidity readings add context to the site assessment. The M2000 2nd Generation also provides audible alerts, trend recording and data export.

Technical points to note for the M2000 2nd Generation:

Measures CO2, PM2.5, PM10, particle number, HCHO, temperature and relative humidity.
CO2 sensing technology: non-dispersive infrared (NDIR).
CO2 range: 0 to 5,000 ppm, with 1 ppm resolution.
PM2.5 and PM10 range: 0 to 999 µg/m³, with 0.1 µg/m³ resolution.
Rechargeable 3,000 mAh battery, with approximately 6 to 8 hours of operation under the manufacturer's stated conditions.
TFT colour display with recording and alert features.
USB data export is a second-generation feature.

Where it is commonly considered: Offices, conference rooms, classrooms, commercial buildings, ventilation assessments, building maintenance investigations and indoor air quality audits.

Selection caution: An M2000 reading does not by itself prove a building meets an HVAC ventilation standard. CO2 varies with occupancy, outdoor concentration, sensor location and other factors. Also, do not choose the M2000 if TVOC measurement is mandatory.

After confirming that CO2 and the other measurement channels match your requirement, review the Temtop M2000 2nd Gen Air Quality Monitor for product details and inquiry support.

Temtop LKC 1000S Plus: A Better Fit for Indoor Chemical Emission Surveys

Now consider a newly furnished office where the concern is a strong odour following renovation work. The facility manager wants to understand how indoor particulate pollution and chemical emission indicators change after cleaning, ventilation and occupancy.

The Temtop LKC 1000S Plus is more closely aligned with this type of screening because it includes TVOC measurement alongside formaldehyde, PM2.5, PM10, AQI indication, particle number, temperature and humidity.

Best for: Facility teams, building maintenance professionals and IAQ consultants conducting multiparameter indoor pollution surveys where TVOC is part of the requirement.

Why this model makes sense: The instrument brings together particulate readings and two chemical-related indicators, HCHO and TVOC, rather than substituting CO2 for TVOC. Its AQI display and historical graph support comparative surveys across rooms and locations. The second-generation version adds USB data export for computer-based review.

Technical points to note for the LKC 1000S Plus 2nd Generation:

Measures PM2.5, PM10, particle number, HCHO, TVOC, AQI, temperature and relative humidity.
Does not include a CO2 measurement channel.
PM2.5 and PM10 range: 0 to 999 µg/m³, with 0.1 µg/m³ resolution.
TVOC is displayed as a combined indicator, not individual chemical compounds.
TFT colour display with real-time readings and trend information.
Rechargeable 3,000 mAh battery, with approximately 6 to 8 hours of operation.
USB data export is available on the second-generation version.

Where it is commonly considered: Newly furnished offices, retail interiors, renovated commercial spaces, schools, hospitality facilities and indoor air quality surveys.

Selection caution: TVOC and HCHO readings from a handheld screening instrument should not be treated as compound-specific laboratory analysis or definitive occupational exposure measurements. If CO2 is required for ventilation assessment, the LKC 1000S Plus is not a replacement for an M2000.

For TVOC-focused indoor monitoring, review the Temtop LKC 1000S Plus Air Quality Monitor after confirming the version and required data export function.

What Both Monitors Can Tell You About PM2.5 and PM10

Both devices measure PM2.5 and PM10, making them useful when the same indoor environment may have particulate pollution as well as gas-related concerns.

PM2.5 refers to particulate matter with an aerodynamic diameter of approximately 2.5 µm or smaller, while PM10 refers to particles up to approximately 10 µm. Their concentrations are commonly expressed as µg/m³.

For example, a facility team can compare a room before and after a filter change or investigate whether dust levels rise when a nearby production activity begins. These are practical screening and trending applications.

However, an optical PM monitor does not directly weigh collected dust. Light scattering instruments estimate particulate concentrations, and readings can depend on aerosol composition and humidity. These monitors should not be confused with certified cleanroom particle counters or regulatory reference sampling equipment.

Which Temtop Air Quality Monitor Should You Choose?

Your actual requirement	Better choice	Why
Investigate CO2 in meeting rooms	M2000	Dedicated CO2 measurement
Examine ventilation in offices and classrooms	M2000	CO2, PM, temperature and humidity
Monitor PM2.5 and PM10	Either	Both report PM metrics
Check formaldehyde with dust	Either	Both include HCHO
Investigate VOC-related conditions after renovation	LKC 1000S Plus	TVOC indication
Compare rooms using AQI	LKC 1000S Plus	Includes AQI display
Measure both CO2 and TVOC	Neither alone	Requires additional measurement capability
Export readings for reports	Confirm second-generation version	Data export varies by model generation

Common Mistakes to Avoid

Confusing CO2 with TVOC: These are separate measurements. A unit that reports one does not automatically report the other.

Treating AQI as an independent sensor: AQI is an index derived from air quality data. It does not replace checking individual pollutant measurements.

Ignoring model generation: Temtop has original and second-generation versions. Data export and recording capabilities should be checked before ordering.

Assuming direct PLC or BMS integration: These are portable monitoring instruments. Do not assume they provide 4 to 20 mA, Modbus RS485 or relay outputs.

Making decisions from one spot reading: Air quality varies with location, occupancy, ventilation and time. A single measurement may not represent the overall environment.

Do This, Not That

Do This	Not This
Decide whether CO2 or TVOC is essential	Select only by number of parameters
Choose M2000 for CO2 investigations	Assume TVOC substitutes for CO2
Choose LKC 1000S Plus when TVOC is required	Assume M2000 measures all indoor gases
Confirm first or second generation	Assume every version supports USB export
Take readings under documented conditions	Depend on one instantaneous value
Verify the sampling method	Treat handheld results as certified compliance tests

Quick Selection Checklist

Before choosing between Temtop M2000 and LKC 1000S Plus, confirm:

Is the primary concern ventilation, chemical emissions or dust?
Is CO2 measurement required in ppm?
Is TVOC measurement required?
Is formaldehyde monitoring necessary?
Are PM2.5 and PM10 measurements required?
Is the instrument intended for troubleshooting, trending or formal reporting?
Is USB data export required?
Which model generation is being quoted?
Does the application require a portable monitor or a permanent BMS-connected instrument?

Why Buy Temtop Air Quality Monitors from Radical TechMart?

At Radical TechMart, selecting an air quality monitor begins by understanding what the customer needs to investigate.

A request for an “air quality meter” may involve CO2 levels in an office, particulate pollution in a building, formaldehyde concerns after renovation or general TVOC screening.

Recommending the same monitor for every enquiry is unlikely to solve all those problems.

Radical TechMart helps buyers compare available Temtop models, clarify the required parameters, review product documentation and select appropriate options for HVAC, facility management and indoor air quality applications.

Final Thoughts

The Temtop M2000 is the stronger starting choice when indoor CO2 monitoring is part of the requirement. Its combination of CO2, PM2.5, PM10, HCHO, temperature and humidity makes it useful for ventilation-related investigations.

The Temtop LKC 1000S Plus makes more sense when TVOC and indoor pollutant screening are priorities. It measures PM2.5, PM10, HCHO and TVOC, alongside AQI, temperature and humidity.

Neither model is automatically better than the other.

The right instrument depends on the parameter that must appear in the final site report.

Frequently Asked Questions

1. What is the main difference between Temtop M2000 and LKC 1000S Plus?

The M2000 measures CO2 but does not list TVOC. The LKC 1000S Plus measures TVOC but does not measure CO2. Both include PM2.5, PM10, formaldehyde, particle number, temperature and humidity.

2. Which Temtop monitor is better for HVAC ventilation checks?

The M2000 is the more appropriate starting choice when CO2 measurement is required to investigate ventilation conditions in occupied rooms.

3. Which model should be used for indoor VOC monitoring?

Choose the LKC 1000S Plus when the site survey requires a TVOC indication. Identifying particular compounds may require a more specific analytical method.

4. Can the LKC 1000S Plus measure CO2?

No. The manufacturer does not list a CO2 measurement channel for the LKC 1000S Plus.

5. Do both models measure PM2.5 and PM10?

Yes. Both models report PM2.5 and PM10 particulate mass concentrations.

6. Can data be exported from both instruments?

Second-generation versions list data export, but original versions do not. Confirm the exact model generation being purchased.

7. Can these instruments replace cleanroom particle counters?

No. Their general indoor air quality particle indications should not be assumed to fulfil formal cleanroom classification requirements.

8. Can either monitor connect directly to a PLC or BMS?

Do not assume so. These are portable air quality instruments, and control-system communication compatibility must be verified separately.

Temtop PMD 331 vs 351 vs 371 | Particle & Aerosol Monitor Guide

Tue, 20 Oct 2026 05:42:14 +0000

Temtop PMD 331 vs PMD 351 vs PMD 371: Particle Count, Aerosol Mass or Both?

A cleanroom engineer asks for a particle counter. An EHS officer asks for a PM2.5 and PM10 dust monitor. A maintenance team wants to understand why an air filter is allowing more particles into a production area.

All three may be discussing airborne contamination, but they are not necessarily asking for the same measurement.

That is the key to choosing between the Temtop PMD 331, PMD 351 and PMD 371. The instruments use laser light scattering, but the information they report is different. Buying the model with the most measurement channels is not always the right decision. First, establish whether your application needs a particle number count, an aerosol mass concentration or both.

Particle Count and Aerosol Mass: What Is the Difference?

A particle counter reports the number of airborne particles detected at specified particle sizes. Its readings help you understand particle contamination in a sampled volume of air. This is particularly useful when investigating cleanroom conditions, particle generation and filtration performance.

An aerosol mass monitor reports an estimated concentration of suspended particles by mass, commonly in µg/m³ (micrograms per cubic metre). Measurements such as PM1, PM2.5, PM4 and PM10 are more useful when a requirement is expressed as particulate mass concentration.

These readings cannot be treated as interchangeable. A cloud of very fine particles can contain a large number of particles without necessarily having the same mass as a smaller number of larger particles. Particle number tells you how many were detected; mass concentration estimates how much particulate material is present per volume of air.

The PMD 371 is intended for situations where both views are needed.

Temtop PMD 331 vs PMD 351 vs PMD 371: Quick Comparison

Selection point	PMD 331	PMD 351	PMD 371
Instrument category	Particle counter	Aerosol monitor	Particle and aerosol monitor
Particle number measurement	Yes	Not listed	Yes
Particle size channels	0.3, 0.5, 0.7, 1, 2.5, 5, 10 µm	Not listed as counting channels	0.3, 0.5, 0.7, 1, 2.5, 5, 10 µm
Aerosol mass readings	Not listed	PM1, PM2.5, PM4, PM10, TSP	PM1, PM2.5, PM4, PM10, TSP
Particle number range	Up to 3,000,000 particles/ft³	Not applicable	Up to 3,000,000 particles/ft³
Mass concentration range	Not applicable	Confirm for supplied version	0 to 9,999.9 µg/m³
Quoted accuracy	±10% for particle counts	±10% under calibration aerosol conditions	±10% for particle counts
Sampling duration	3 to 60 seconds	60 seconds	1, 2, 5, 10, 15, 30 or 60 minutes
Airflow	2.83 L/min	2.83 L/min	2.83 L/min
Measurement principle	Laser light scattering	Laser light scattering	Laser light scattering
Ideal starting point	Count airborne particles	Monitor PM mass concentration	Investigate both count and PM mass

All three models are listed with a 4-inch TFT LCD, rechargeable battery, approximately eight hours of operation, USB/RS485 communication and onboard data storage. Before planning a control-system connection, confirm the exact interface and protocol of the supplied instrument.

Temtop PMD 331: When Particle Number Matters Most

Imagine a pharmaceutical production area where the maintenance team has replaced an air filter. The question is not simply whether the PM2.5 mass concentration has changed. They may need to examine how the number of airborne particles changes at specific sizes before and after maintenance.

This is the type of investigation where the Temtop PMD 331 Particle Counter makes sense.

Best for: Teams whose monitoring requirement is expressed as particle counts rather than particulate mass.

Why this model makes sense: The PMD 331 reports seven particle size channels, from 0.3 µm to 10 µm. This gives an engineer more useful particle size information than a single overall dust reading. Its selectable 3 to 60 second sampling period can also be practical for short checks at multiple locations.

Technical points to note:

Seven reported particle sizes: 0.3, 0.5, 0.7, 1, 2.5, 5 and 10 µm
Particle number measurement range up to 3,000,000 particles/ft³
Quoted particle number accuracy of ±10% with calibration aerosols
Nominal sampling airflow of 2.83 L/min
Laser light scattering measurement principle
Selectable sampling time from 3 to 60 seconds
Manufacturer brochure states ISO 21501 compliance

Where it is commonly considered: Pharmaceutical manufacturing areas, electronics assembly, controlled environments, air filtration investigations, cleanroom maintenance checks and particle contamination studies.

Selection caution: Do not choose the PMD 331 when the customer specifically needs PM2.5 or PM10 in µg/m³. Also, cleanroom classification or formal HEPA integrity testing requires the applicable procedure and verified instrument calibration, not simply a particle count displayed on the screen.

Temtop PMD 351: When Aerosol Mass Is the Requirement

Consider an industrial workshop where cutting, material handling or nearby production activity generates airborne dust. The EHS or facility team wants to compare particulate conditions at different locations, especially using PM2.5 and PM10 values.

For that requirement, the Temtop PMD 351 Aerosol Monitor is the more direct choice.

Best for: Industrial dust surveys and general air quality investigations where the required result is particulate mass concentration in µg/m³.

Why this model makes sense: Instead of displaying the seven particle count channels, the PMD 351 reports five aerosol mass metrics: PM1, PM2.5, PM4, PM10 and TSP. The display is easier to align with a monitoring requirement that already specifies a PM mass metric.

Technical points to note:

Five displayed mass metrics: PM1, PM2.5, PM4, PM10 and TSP
Mass concentration resolution of 0.1 µg/m³
Quoted accuracy of ±10% under calibration aerosol conditions
Nominal sampling airflow of 2.83 L/min
Laser light scattering measurement principle
Sampling time of 60 seconds
Rechargeable battery and handheld design

Where it is commonly considered: Factory dust investigations, industrial HVAC surveys, ventilation performance checks, warehouses, indoor air quality investigations and site-to-site PM comparisons.

Selection caution: Optical aerosol instruments estimate mass from light scattering. Actual readings can be affected by dust composition, particle shape and moisture. Do not automatically treat a handheld optical reading as equivalent to a reference gravimetric test or a prescribed occupational exposure compliance measurement. Also confirm the mass measurement range for the version being supplied.

Temtop PMD 371: When Particle Count and Aerosol Mass Are Both Needed

Some investigations do not fit neatly into a particle counter or a mass monitor category. Suppose a manufacturing facility has recurring airborne contamination. The quality team is concerned about the number of particles reaching a sensitive process, while the facility team wants PM2.5 and PM10 trends to evaluate the overall dust condition.

Using two separate instruments may be inconvenient. The Temtop PMD 371 Particle & Aerosol Monitor combines the two sets of readings in one handheld unit.

Best for: Cross-functional air contamination investigations where engineers need both particle number and aerosol mass information.

Why this model makes sense: The PMD 371 reports the same seven particle size channels associated with the PMD 331 and the five PM mass metrics associated with the PMD 351. An investigator can therefore review particle count and PM concentration during the same monitoring exercise without switching between different instrument categories.

Technical points to note:

Seven particle counting sizes: 0.3, 0.5, 0.7, 1, 2.5, 5 and 10 µm
Five mass metrics: PM1, PM2.5, PM4, PM10 and TSP
Particle number range up to 3,000,000 particles/ft³
Mass concentration range from 0 to 9,999.9 µg/m³
Mass concentration resolution of 0.1 µg/m³
Nominal sampling airflow of 2.83 L/min
Selectable sampling periods of 1 to 60 minutes
Manufacturer brochure states ISO 21501 compliance for particle counting

Where it is commonly considered: Pharma and electronics facilities, manufacturing contamination investigations, clean production areas, filtration studies, HVAC performance assessments and technical air quality surveys.

Selection caution: The quoted ±10% particle number accuracy should not be assumed to apply to every PM mass output. Check the applicable accuracy specification for each measured parameter. The PMD 371 is also not automatically the better purchase when the customer needs only one measurement type.

Which Temtop Model Fits Your Application?

Actual requirement	Model to consider	Why
Count airborne particles by size	PMD 331	Designed for particle number reporting
Perform routine particle contamination investigations	PMD 331	Multiple particle size channels and short sample options
Measure PM2.5 and PM10 in µg/m³	PMD 351	Reports aerosol mass metrics directly
Compare general dust conditions in a workshop or warehouse	PMD 351	Useful when PM concentration is the requested result
Investigate both clean-area particle levels and overall dust trends	PMD 371	Combines number and mass reporting
Share one instrument between quality, maintenance and facility teams	PMD 371	Covers both measurement approaches

What to Confirm Before Buying

The mistake many buyers make is selecting a dust monitor by the model name, display appearance or number of channels alone. A better approach is to clarify what the engineer will do with the readings.

Identify the reporting unit. Does the requirement specify particle counts or µg/m³?
Confirm particle sizes or PM metrics. For example, 0.3 µm particle counts are not the same output as PM2.5 mass concentration.
Check sampling time. A short site check and a longer investigation may need different sampling settings.
Ask about calibration. Confirm the calibration certificate, date, aerosols used and any relevant compliance requirements.
Confirm communication. USB/RS485 availability does not by itself confirm a particular PLC, SCADA or Modbus implementation.
Review the operating environment. High dust loadings, humidity and aerosol characteristics can affect the suitability of an optical instrument.
Define the purpose of the test. Troubleshooting, trending, cleanroom classification and statutory compliance do not have identical instrument requirements.

Common Selection Mistakes

Do this	Avoid this
Ask whether results must be reported as counts or µg/m³	Assume all particle monitors measure the same thing
Select PMD 331 for particle number investigations	Buy a count-only instrument for PM10 mass reporting
Select PMD 351 for PM mass comparisons	Use PM mass values as a substitute for particle counts
Choose PMD 371 when both sets of information have a defined purpose	Pay for hybrid capability without a use case
Confirm calibration and test method requirements	Assume a marketing compliance claim covers every site procedure

Why Buy Temtop Particle Monitoring Instruments from Radical TechMart

At Radical TechMart, product selection begins with the measurement requirement, not just a part number.

A purchase inquiry for an “air particle monitor” may actually refer to cleanroom particle counting, industrial PM concentration measurement or a combined investigation. Those are different applications, and identifying the distinction early helps prevent a costly mismatch.

Our team can help you compare the Temtop PMD 331, PMD 351 and PMD 371 based on the reported parameters, sampling requirement, application, available specifications and commercial requirements.

Final Thoughts

The Temtop PMD 331 is the logical starting point when your requirement is to count airborne particles at defined sizes. The PMD 351 is more appropriate when you need aerosol mass information such as PM2.5, PM10 and TSP. The PMD 371 brings both measurement types together for investigations that need a broader picture.

Before ordering, ask one practical question: What measurement does the final report or maintenance decision actually require? Once that is clear, choosing the right Temtop model becomes much easier.

Frequently Asked Questions

1. What is the main difference between Temtop PMD 331 and PMD 351?

The PMD 331 reports particle number across seven size channels. The PMD 351 reports aerosol mass metrics such as PM1, PM2.5, PM4, PM10 and TSP in µg/m³.

2. Does Temtop PMD 331 measure PM2.5 mass concentration?

The PMD 331 specification does not list PM2.5 mass concentration as an output. It lists a 2.5 µm particle counting channel, which is a different measurement.

3. Is Temtop PMD 371 better than PMD 331?

Not for every application. PMD 371 offers both particle number and mass reporting, while PMD 331 is a more focused choice when only particle counting is needed.

4. Which Temtop model should I use for PM10 dust monitoring?

Consider PMD 351 when you need PM10 mass concentration. Choose PMD 371 if your investigation also requires particle counting.

5. Can I use PMD 331 or PMD 371 for cleanroom testing?

Their brochures state ISO 21501 compliance for particle counting. For formal cleanroom classification, confirm instrument calibration, required sampling procedure and suitability under the applicable cleanroom standard before testing.

6. Can these instruments connect to a PLC or SCADA system?

The supplied brochures list USB/RS485 communication. Verify the actual communication protocol, data format and model configuration before specifying PLC or SCADA integration.

7. Does the PMD 371 measure dust mass directly?

No. It uses laser light scattering and reports estimated aerosol mass concentration. It does not replace a gravimetric laboratory measurement simply because it displays µg/m³.