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Item #:
3464305
Extech CO240 - Indoor Air Quality Meter - Handheld CO2, Temperature, Humidity, Dew Point & Wet Bulb Monitor with Audible Alarm | CO2, temp, RH, dew
Item #:
3464305
USD 225
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Imported from USA store
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Order now and get it around Saturday, August 22
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The CO240 measures Carbon Dioxide (CO2), Air Temperature and Humidity, as well as Dew Point and Wet Bulb calculations. Maintenance free NDIR (non-dispersive infrared) CO2 sensor. Audible CO2 warning alarm when concentration level exceeds high user set point
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What Stands Out
Real-time Monitoring
Provides continuous readings of indoor air quality and CO2 levels, ensuring users can maintain a healthy environment and act swiftly to mitigate risks from poor air quality.
Data Logging
Equipped with data logging functionality, allowing users to track air quality trends over time for informed decision-making regarding ventilation and air circulation improvements.
User-friendly Interface
Features a clear, easy-to-read display with intuitive controls, making it accessible for both professionals and DIY enthusiasts looking to monitor indoor air quality efficiently.
Product Details
- Dual display shows Carbon Dioxide (CO2) concentrations and Relative Humidity, Temperature, Dew Point, or Wet Bulb
- Utilizes maintenance free NDIR (non-dispersive infrared) CO2 sensor
- Features audible CO2 warning alarm when concentration level exceeds high user set point
- Includes Min/Max CO2 value recall function and Data Hold, Auto Power Off (with disable), Low battery indicator
- Measures Carbon Dioxide (CO2), Air Temperature and Humidity, with Dew Point and Wet Bulb calculations
- Comes with six AAA batteries, USB cable, PC software, and soft case
| Package Weight | 4.34 Pound |
Who Should Buy?
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Environmental Monitors
Ideal for professionals monitoring indoor environments to ensure air quality meets health and safety standards.
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HVAC Technicians
Suitable for HVAC technicians who need accurate measurements of CO2 levels and air quality for system adjustments.
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Homeowners
Beneficial for conscious homeowners wanting to monitor air quality and improve ventilation in their living spaces.
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Casual Users
Not ideal for casual users who require basic air quality information without need for detailed measurements.
Product Description
Extech CO240 - Indoor Air Quality Meter - Handheld CO2, Temperature, Humidity, Dew Point & Wet Bulb Monitor with Audible Alarm | CO2, temp, RH, dew point, wet bulb, NDIR, audible alarm, USB datalogging, tripod mount, 6 AAA
Have any Query? Chat with us
Customer Questions & Answers
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Question:
What is the main function of the Extech CO240 Indoor Air Quality Meter?
Answer: The Extech CO240 is designed to measure indoor air quality by detecting levels of carbon dioxide (CO2), temperature, and humidity. It features a dual display that allows users to see multiple measurements at once, ensuring a comprehensive understanding of their environment. This device is particularly useful in environments like offices, homes, and classrooms where monitoring air quality is crucial for health and comfort. -
Question:
How does the dual display feature benefit users?
Answer: The dual display of the Extech CO240 shows CO2 levels alongside temperature and humidity readings. This feature enhances user experience by providing a quick visual comparison of environmental conditions without the need to toggle between screens. It's especially beneficial in situations where air quality impacts comfort, such as in crowded spaces or during activities like cooking or exercising. -
Question:
What types of users would benefit most from using the Extech CO240?
Answer: The Extech CO240 is ideal for a variety of users including indoor air quality professionals, HVAC technicians, educators, and homeowners concerned about air quality. For example, schools can utilize this meter to monitor CO2 levels in classrooms to ensure a healthy learning environment, while HVAC technicians can use it to assess system performance and air flow. -
Question:
Can I use the Extech CO240 for outdoor air quality measurements?
Answer: The Extech CO240 is designed primarily for indoor use; it may not provide accurate readings in outdoor environments due to factors like wind and intermittent airflow. However, it can be utilized in semi-outdoor areas like patios or garages to assess air quality where buildings meet the outside. This capability helps users analyze air quality in transitional spaces. -
Question:
What is the range of CO2 measurement for the Extech CO240?
Answer: The Extech CO240 measures CO2 concentrations ranging from 0 to 5,000 parts per million (ppm). This extensive range allows users to evaluate air quality in various settings, particularly where ventilation is a concern. For instance, if monitoring a crowded office or gymnasium, the ability to detect high CO2 levels can help prompt ventilation adjustments to ensure a healthier indoor environment. -
Question:
Does the Extech CO240 have any data logging capabilities?
Answer: The Extech CO240 does not feature data logging capabilities; however, it provides real-time measurements that can be crucial for immediate evaluations. Users can keep a manual record of the readings, particularly during specific activities or events. This is particularly useful for conducting air quality assessments at different times of the day to gauge variations in CO2 levels. -
Question:
Is the Extech CO240 portable?
Answer: Yes, the Extech CO240 is a handheld device, making it highly portable and easy to use in various locations. Its compact design enables users to carry it to different rooms or even transport it between buildings, making it an excellent choice for professionals who need to monitor air quality across multiple sites or for personal use at home and in the office. -
Question:
How do I calibrate the Extech CO240 for accurate readings?
Answer: Calibration of the Extech CO240 is essential for maintaining its accuracy. To calibrate, bring the device to an area with known CO2 levels or follow specific calibration procedures outlined in the user manual. Performing calibration regularly, especially after prolonged use, ensures that the readings remain reliable. This practice is particularly vital for environments where precise air quality monitoring is necessary. -
Question:
What units of measurement does the Extech CO240 use?
Answer: The Extech CO240 displays CO2 measurements in parts per million (ppm), while temperature is shown in either Celsius or Fahrenheit, depending on user preference. Humidity is displayed as a percentage. This flexibility allows users to interpret the readings according to their needs, whether for personal use, research, or professional applications. -
Question:
Where can I buy the Extech CO240 Handheld Indoor Air Quality and CO2 Meter?
Answer: You can purchase the Extech CO240 Handheld Indoor Air Quality and CO2 Meter from Ubuy. They offer a straightforward shopping experience with a wide selection of products that cater to your indoor monitoring needs.
Extech Indoor Air Quality Meters Editorial Review
The Extech CO240 Handheld Indoor Air Quality and Carbon Dioxide Meter is a convenient little unit for energy audits of buildings. The CO2 reading is accurate, and the temperature and humidity values appear to be within reasonable ranges. However, the temperature reading is a bit slow to respond and might not be suitable for tasks that require fast response time. The meter is highly sensitive, and readings settle down after a few seconds, making it imperative to maintain a distance from the meter. The unit is reliable for getting a rough idea of readings. Still, with notably high battery Consumption, it might not be the most practical option for extended use.
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Pros
- Accurate CO2 meter
- Quick response time for temperature and humidity
- Highly sensitive
Cons
- Slow temperature response time
Platform Trust & Buyer Confidence
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“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”
23 July 2026 · via Trustpilot
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“The order and delivery progress was communicated very well. Package arrived within the estimated time. Products arrived as expected in good condition.”
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USD 225
Order now and get it around Saturday, August 22
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Features & Benefits
- Measures CO2, air temperature and humidity
- Maintenance free NDIR CO2 sensor
- Audible CO2 warning for high concentration
- Data Hold, Auto Power Off (with disable), Low battery indicator
- Dual display of CO2 and Relative Humidity, Temperature, Dew Point, or Wet Bulb
- Comes with batteries, USB cable, PC software and soft case
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