Why Temtop M10i Formaldehyde or TVOC Reading Is High Malaysia
Meta Description: Learn why Temtop M10i formaldehyde or TVOC readings may increase and how to investigate furniture, cleaning, ventilation and placement in Malaysia.
A high or suddenly changing HCHO or TVOC reading on the Temtop M10i does not automatically identify one specific source.
Indoor readings may be influenced by:
New furniture
Renovation materials
Cleaning products
Fragrances
Ventilation
Temperature and humidity
Instrument position
Recent room activities
The Temtop M10i is most useful for screening and trend comparison. Users should investigate the surrounding conditions before drawing conclusions from one reading.
What Does the Temtop M10i Measure?
The M10i monitors:
HCHO (formaldehyde)
TVOC
PM2.5
AQI
HCHO and TVOC are separate readings.
HCHO represents the instrument’s formaldehyde measurement.
TVOC is a combined indicator associated with various volatile organic compounds.
A TVOC reading cannot identify every individual chemical present in the room.
Common Reasons for a High HCHO Reading
Possible sources may include:
Composite-wood furniture
Built-in cabinets
Wardrobes
Laminated panels
Flooring materials
Adhesives
Sealants
New decorative materials
Recent renovation
The reading may also change when the room becomes warmer, more humid or less ventilated.
A high result near a cabinet does not necessarily represent the average condition throughout the room.
Common Reasons for a High TVOC Reading
TVOC may increase after using:
Cleaning sprays
Disinfectants
Alcohol-based products
Air fresheners
Perfume
Paint
Solvents
Adhesives
Personal-care products
Pest-control products
If TVOC rises suddenly, review what happened in the room immediately before the increase.
Historical trends can help match changes to specific activities.
Why Can Cleaning Products Affect the Reading?
Many cleaning products contain volatile ingredients.
A TVOC increase after cleaning may be caused by:
Surface-cleaning sprays
Floor cleaners
Glass cleaners
Disinfectants
Fragranced products
Alcohol-based sanitisers
To check whether cleaning is responsible:
Record the reading before cleaning.
Note the products used.
Keep the monitor away from direct spray.
Observe the trend during and after cleaning.
Ventilate where appropriate.
Check how long the reading takes to decrease.
Do not spray any product directly at the monitor.
Why Can Perfume or Air Freshener Cause a Sudden Increase?
Perfume, deodorant and air freshener release volatile compounds into the air.
If used close to the M10i, they may produce a rapid TVOC response that does not represent the property’s normal background condition.
For general room monitoring:
Avoid using sprays nearby
Wait for the room to return to normal conditions
Ventilate if suitable
Keep the monitor in a consistent position
Review the historical trend rather than deleting or ignoring the event
The increase itself may provide useful evidence about how strongly the room is affected by product use.
Why Does the Reading Rise When the Room Is Closed?
When doors and windows are closed:
Fresh-air exchange decreases
Volatile compounds may accumulate
Room temperature may rise
Humidity may change
Emissions from materials may continue
A room may show lower readings immediately after ventilation and higher readings after remaining closed overnight.
This is why post-renovation monitoring should include both ventilated and closed-room conditions.
Can Temperature and Humidity Affect Readings?
Temperature and humidity may influence:
The release of volatile compounds from materials
Sensor response
Room ventilation
Chemical behaviour
The M10i does not display temperature or humidity.
If these parameters are important to the investigation, use an additional thermo-hygrometer or consider a broader Temtop model.
Record environmental conditions where possible when comparing different days.
Why Does the Reading Change After Moving the Monitor?
Different locations within the same room may have different concentrations.
A monitor placed:
Beside a new wardrobe
Near a window
Under an air conditioner
Inside a cabinet
Next to cleaning chemicals
may show a different result from one positioned in the centre of the occupied space.
After moving the instrument, allow enough time for it to respond to the new environment before recording the reading.
How to Check Whether Placement Is the Problem
For general monitoring:
Position the M10i at normal breathing height.
Keep it away from direct airflow.
Keep its air inlets unobstructed.
Avoid placing it directly beside a suspected source.
Allow the reading to stabilise.
Repeat the test in the same location.
Compare with another representative area.
Label any reading taken near or inside furniture as a targeted source-area measurement.
What If HCHO and TVOC Move Differently?
This can happen because they are different indicators and may respond to different substances.
For example:
A cleaning product may increase TVOC strongly
New composite furniture may affect the HCHO trend
Ventilation may reduce both at different rates
Other sensor influences may affect the displayed results
Do not expect HCHO and TVOC to always increase or decrease together.
What Should You Do After a High Reading?
A practical investigation may include:
Confirm the monitor is correctly positioned.
Record the reading and room conditions.
Remove obvious open chemical products.
Stop using sprays and fragrances.
Ventilate when outdoor conditions are suitable.
Check whether new furniture or materials were added.
Observe the historical trend.
Repeat the test under similar conditions.
Compare another room.
Seek professional assessment if the result remains unexplained.
Change one factor at a time. Making several changes simultaneously makes it difficult to identify which action affected the reading.
Can an Air Purifier Reduce the Reading?
It depends on the purifier design and pollutant.
A particulate filter may reduce PM2.5 but may not remove gaseous pollutants effectively.
Some purifiers use adsorption media intended for certain gases, but performance depends on:
Filter type
Filter condition
Pollutant
Room size
Source strength
Operating time
Airflow
Monitor PM2.5, HCHO and TVOC separately. Improvement in one parameter does not prove that all three have improved.
Could the Monitor Require Checking?
If readings appear abnormal:
Review the user manual
Confirm correct operating conditions
Allow adequate start-up and stabilisation time
Keep the sensor openings clean and unobstructed
Avoid direct exposure to chemicals
Compare readings under known conditions
Contact the supplier for technical guidance
Do not attempt unauthorised disassembly or apply liquids to the sensor openings.
Can a High Reading Confirm a Regulatory Violation?
No. A high screening reading does not by itself establish regulatory non-compliance or identify a specific chemical source.
Formal conclusions may require:
Calibrated professional equipment
Documented sampling procedures
Laboratory analysis
Qualified assessors
Relevant standards
Controlled testing conditions
The M10i supports initial screening and trend investigation.
When Should Professional Help Be Considered?
Seek professional advice when:
Readings remain persistently elevated
Strong odours continue
A specific chemical must be identified
Occupants report recurring discomfort
A workplace or public building is involved
Legal documentation is required
Renovation disputes arise
Laboratory confirmation is necessary
Contact MTM Precision
Contact MTM Precision for assistance with Temtop M10i HCHO, TVOC or PM2.5 monitoring applications in Malaysia.
MTM Precision Sdn. Bhd.
Showroom & Service Centre
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia
🌐 Website: www.mtmpre.com.my
📧 Email: mtmpre@yahoo.com
📱 WhatsApp: +6016-660 7346
29 Aug 2026
