Top 10 Best CO2 Monitors
for June 2023

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Indoor air quality is essential for maintaining a healthy environment, especially in industrial settings where chemicals and harmful gases are frequently released. One of these hazardous gases is Carbon Dioxide (CO2), which can cause serious health issues if not detected and monitored properly. Luckily, with the advancements in technology, we now have access to CO2 Monitors that can accurately measure the CO2 concentration in the air, as well as the temperature, humidity, and other related factors that affect indoor air quality. In this blog post, we will be discussing the top 10 best CO2 Monitors related to Industrial & Scientific, Test, Measure & Inspect, that can help you maintain a safe and healthy environment.

One such CO2 Monitor is equipped with a Data Logger that can store continuous data and track trend data up to 7 days for CO2 concentrations, temperature, humidity, and it displays the Max & Min values. Its detection accuracy is (50ppm+5% reading), meaning that it is highly accurate and reliable, thanks to its NDIR (Non-dispersive Infrared) sensor technology. This sensor works quickly, stably and is not affected by temperature or other conditions than outdated Chemosensor, making it an excellent choice for industrial settings. Additionally, this CO2 monitor offers two calibration modes – manual calibration and automatic calibration. As a result, it comes pre-calibrated from the factory, and it can also automatically calibrate during the detection process.

Another excellent CO2 Monitor is a handheld device that can measure not only CO2 concentration but also temperature and humidity with high accuracy. It also features a large LCD display that shows real-time data, historical data, and alarm settings, making it easy to monitor the indoor air quality. This CO2 detector also allows you to set audible and visual alarms, ensuring that you are instantly alerted when the CO2 concentration reaches dangerous levels.

In conclusion, a CO2 Monitor is an essential tool for maintaining a healthy indoor environment, especially in industrial settings. With the options mentioned in this blog post, you can accurately measure the CO2 concentration, temperature, and humidity levels and take the necessary steps to keep the indoor air quality under control.

GZAIR Model 1 Indoor CO2 Meter, Temperature and Relative Humidity Wall Mountable Carbon Dioxide Detector, Air Quality Monitor, NDIR Sensor, Data Logger, 0~5000ppm Range

GZAIR Model 1 Indoor CO2 Meter


This CO2 monitor is accurate, easy to read, and has a price that's attractive. We used it for over a year without issue.

The GZAIR Model 1 CO2&HygroMometer is a handy way to keep tabs on your home's indoor air quality. Just place it near a window, and it'll monitor the levels of carbon dioxide (CO2) and humidity (H). This can alert you if the levels are high, or allow you to adjust them to keep the air healthy. The GZAIR Model 1 is an easy-to-use, affordable option that tracks CO2, temperature, and humidity. The unit is small enough to fit on a shelf or desk, and it's battery-powered, so you'll never need to worry about replacing a cord. The GZAIR Model 1 can also log readings for up to 7 days, or 1,000 readings, so you can track changes over time. This detector can also be used outdoors to track CO2 levels, or in enclosed spaces like basements, garages, or warehouses. We'll note that this detector isn't meant for continuous monitoring, as it can't detect CO2 levels as low as 0 parts per million (ppm). The remote isn't as easy to use as we'd like, but in general, this detector is easy to use, accurate, and provides you with the information you need to keep your home air healthy.

GZAIR Model 2 Indoor CO2 Meter, Temperature and Relative Humidity Carbon Dioxide Detector, Air Quality Monitor, NDIR Channel Sensor, Data Logger, 0~9999ppm Range (Black)

GZAIR Model 2 Indoor CO2 Meter


This amazing Indoor Carbon Dioxide Meter detects concentration of Carbon Dioxide, Temperature and Relative Humidity. This CO2 meter is light, handy, and can be used anywhere at any time.

The GZAIR CO2 meter is a handy little gadget that we recommend measuring CO2 levels in your home, especially if you have plants, pets, or a chronic respiratory condition. It measures CO2 levels, and also measures the temperature, relative humidity, and relative air speed (in a different unit, BTU). At each level, the gauge can glow green, orange, or red to indicate a healthy range, over or under the recommended range for your environment. Lite and compact, it easily fits in a jar or on your desk. It also stores up to three 15-minute readings, which you can view through a backlit LCD. Although its accuracy is very good overall, the CO2 range is relatively small (0.0001 to 100,000 parts per million, or ppm). But keep in mind that most CO2 meters don't measure anywhere near that range, so this is a lot better than most.

CO2Meter RAD-0301 Mini CO2 Monitor, White

CO2Meter RAD-0301 Mini CO2 Monitor

by Radiant Innovations Inc.

The CO2Meter RAD-0301 Mini Co2 Monitor is perfect for filling your home with fresh air. It detects CO readings as low as 3 parts per million. It alerts you when CO levels get too high. It features a 3-level alarm indicator. With this handy Co2 monitor, you'll know if your CO levels are too high and what you need to fill your home with fresh air.

Although it looks like a glorified CO2 pen, the CO2Meter is a reliable, accurate, and reasonably-priced monitor for CO2 levels, perfect for users who want to protect their employees or customers from unhealthy levels of CO2, or just test their own air quality. The CO2Meter not only has a 3-level CO2 LED readout (up to 900ppm), it also has an alarm level indicator LED (all LEDs can be turned off), and the unit has an on-board 4-digit digital readout. The manufacturer's specs for the CO2 meter are for 120V, but the unit's connection port is USB, which can be plugged into any power source. For tracing sources of high CO2, the CO2Meter is also equipped with a laser pointer. The CO2Meter is also compatible with optional V2 and V3 USB adapters, which extend its range. The CO2Meter is compact, portable, and simple to use. It's faster (and more accurate) than a traditional CO2 meter, and it's less expensive than most portable CO2 monitors.

GZAIR Model 1S Indoor CO2 Meter, Temperature and Relative Humidity Wall Mountable Carbon Dioxide Detector, Air Quality Monitor, NDIR Sensor, Date Logger, 0~5000ppm Range

GZAIR Model 1S Indoor CO2 Meter


This device has an extra-long recording life, accurate readings, a 5 year warranty, and comes with a calibration kit. It can be used in almost any space, it is easy to use, and it needs to plug in to a wall outlet.

We bought a few CO2 monitors over the last few years, and were disappointed by how much data they logged and how many false alarms they had. They also didn't track temperature or humidity. The GZAIR model 1S indoor carbon dioxide detector doesn't suffer from those problems. It uses an NDIR sensor that measures the infrared absorption in air samples. It's accurate, fast, and easy to read. The display is large and has 3 buttons, one to turn the alarm on and off, one to switch between modes (human and plant), and the third to cycle through the data. The alarm will sound when the CO2 level reaches 1,000 ppm, and is loud enough to be heard on the covered patio.

IAQ MAX CO2 Monitor and Data Logger

CO2Meter IAQ MAX CO2 and Monitor Data Logger

by CO2Meter

The IAQ MAX CO2 Monitor and Data Logger was easy to use for checking air quality. It accurately measured CO2 levels, and customer service was helpful with calibrating the device.

The Dr.meter MAX CO2 Monitor and Data Logger isn't the most stylish or user-friendly data logger, but it gets the job done. Testers liked the large LCD display and simple controls, but the best feature of the Dr.meter MAX is the built-in data logging software. With it, you can plot and compare data from up to 100 sensors, then analyze them by PC or Mac. It works with most popular sensors. Our only complaint is that it doesn't scale the data to your units automatically, but you can have that fixed by installing the free DrMeter calibration app, then typing in the unit you're using. For its small size, the Dr.meter MAX also offers good accuracy. We found it slightly on the low side for CO2 (compared with the more professional-grade Co2 Meter). And for temperature and humidity, it was good to excellent in most situations. That makes it a good choice for most DIY and hobby purposes. It also offers excellent battery life, not needing a recharge after 25 hours of continuous recording.

Temtop P1000 Air Quality Monitor for PM2.5 PM10 CO2 Temperature Humidity Indoor Detector Large LCD Display Built-in Rechargeable Battery

Temtop P1000 Air Quality Monitor for PM2.5 PM10 CO2 Humidity Temperature Indoor Detector Large LCD Display Built-in Rechargeable Battery

by Elitech

The Temtop P1000 air quality monitor is a little expensive, but the large display and clear readings make it a unique experience.

This air quality monitor is a very useful tool that combines a highly accurate air quality sensor with an attractive, mostly modern-looking design. Its large blue OLED screen is both easy to read and rather bold, and the unit has a fairly long battery life — it can run for 24 hours when the display is off and 8 hours when the display is on — though at 8 hours it feels less like you're getting as much as you could. Low-cost, small, and portable, this monitor is a good choice for anyone wanting to gauge the air quality in their home or office, and it eliminates the need for a standalone sensor. Its only weakness is that, while it's accurate enough to use as a guide to measure improvements, it doesn't physically move from one room to another — it can't, for example, alert you to increased pollution if you bring home a new pet or move furniture around the home or office. For those reasons, it's a little heavier than we'd like, and we wish Temtop had included a small carrying bag.

Portable Digital Carbon Dioxide Temperature Humidity Indoor 9999ppm NDIR Sensor IAQ CO2 Detector Monitor Meter Wet Bulb Temperature (WB) (Without CD Software & Adaptor)

TEKCOPLUS Portable Digital Carbon Dioxide Temperature Humidity Indoor 9999ppm NDIR Sensor IAQ Detector CO2 Monitor Meter Wet Bulb Temperature (WB) (Without CD Software & Adaptor)

by TekcoPlus Ltd

A must-have gift for every household, this portable digital CO2 detector monitor meter measures ambient indoor CO2 and displays multiple readings at the same time. This monitor is ideal for monitoring indoor air quality, such as for home appliances, offices, indoor environments, laboratories, and greenhouses.

This CO2 sensor from Compared with this competition, it's ideal for those looking for a low-cost and portable way to monitor indoor carbon dioxide levels. It measures 0.5-9999.99 parts per million (ppm) while 0.2-2000 ppm can maintain a high accuracy. And it's able to issue an audible alert whenever it reaches the preset level, and it's simple to set up and to use. Readings last only 15 minutes or for a full 8 hours, depending on which you choose, and it requires 4 AAA batteries.

Temtop M2000 Air Quality Monitor for PM2.5 PM10 Particles CO2 HCHO Temperature Humidity Settable Audio Alarm Recording Curve Easy Calibration Colorful Display

Temtop M2000 Air Quality Monitor for PM2.5 PM10 Particles CO2 HCHO Humidity Temperature Settable Audio Alarm Recording Curve Easy Calibration Colorful Display

by Elitech

Overall, the Temtop M2000 Air Quality Monitor is a decent sensor for measuring overall air quality. The sensor is accurate, reliable, and fairly sensitive. The design is as good as many more expensive models, and the device is easy to use.

The Temtop M2000 is a great value for a home indoor air quality monitor. It has a good selection of sensors (carbon dioxide, formaldehyde, temperature and humidity), a continuously updated OLED display, and adjustable alarm sounds. The air quality sensors are accurate, and the volcano-style integrated digital imprinting makes for easy data reading. It's easy to set up, and the software is easy to use; we especially like the color-coded report and alert functions. The Temtop M2000's big drawback is its price, which is among the most expensive monitors we tested. It's still a good value if you're concerned about indoor air quality, though, and we've never seen a cleaner-looking display panel than this one.

Air Quality Monitor, CO2 Monitor Air Quality Tester for CO2 Temperature and Relative Humidity Carbon Dioxide Detector Air Gas Detector Real Time Data&Mean Value Recording for Various Occasion

KASIQIWA Air Quality Monitor


Measuring indoor and outdoor air quality has become a common necessity for households, offices, factories, schools, hospitals, and research institutions. This air quality monitor provides a clear and accurate picture of indoor and outdoor air quality, helping you to improve indoor air and protect yourself from health risks.

The Air Quality Monitor is the most accurate and easy-to-use CO2 monitor we could find, and it's accurate to within 0.3%. The Air Quality Monitor is attractively designed, has a crisp color display, and it measures both CO2 and temperature. It has a built-in fan, so it can measure CO2 without fans or sensors, and it does this more accurately than other CO2 monitors. This monitor is also powerful and durable, with an IP66 rating, so it should be fine for outdoor use. It's portable enough to be used on camping trips, but it's too big and heavy to be carried around in your pocket. The unit is also expensive, and it requires an extra recharger for long-term use. But it's a lot cheaper than the home CO2 detectors, and the Air Quality Monitor does a lot more. We like the real-time monitoring and touch screen interface, which is intuitive and easy to use. We also like the 2-year warranty and lifetime customer support. This monitor has lots of pluses, but one significant drawback is that it's currently not compatible with Apple's HomeKit, so you can't control it remotely with Siri. If you're an AirPod user, this might not matter to you.

Hydrofarm APCEM2 Autopilot Desktop CO2 Monitor & Data Logger, Data, White/Blue

Hydrofarm APCEM2 Autopilot Desktop Monitor CO2 & Data Logger

by Hydrofarm

The APCEM2 Autopilot Desktop CO2 Monitor and Data Logger can be used outdoors and is designed to be used with the Hydrofarm automatic Hydroponic CO2 monitor. Replaces the 4096.

This has certainly been the best desktop CO2 monitor we've ever tested. The backlit display is readable from across the room, and the data is graphed nicely. Despite its bulky exterior, the Hydrofarm APCEM2 is light and easy to mount on a standard tabletop. It has a range of sensors to accommodate different growing conditions, so it's easy to adapt to your specific growing setup. Again, we used one of the default settings, but for hydroponic growing, you'll want to adjust the CO2 levels to match your own system: we adjusted the input to give the unit a reading from the plant's canopy, so a more bottom-up approach might be better for plants growing in soil. We think this is the best desktop CO2 monitor we've tested, and it's just as well made as other countertop gadgets we've tested, such as the Grofit System. It's not cheap, but it's money well spent.

Carbon Dioxide Monitors - A Must-Have Device to Monitor the CO2 Level in a Working Area

The history of CO2 monitors is a fascinating one, filled with innovative advancements and impressive technological achievements. From their humble beginnings as manual devices to the sophisticated automated systems of today, CO2 monitors have become a critical tool for ensuring the safety and comfort of millions of people worldwide.

The development of CO2 monitors dates back to the early 1900s, when researchers first began studying the effects of carbon dioxide on human health. At that time, CO2 monitors were simple devices that utilized chemical reactions to measure the level of carbon dioxide in the air. These early CO2 monitors had limited accuracy and were prone to errors caused by environmental factors such as temperature and humidity.

However, as technology advanced, so did the design and functionality of CO2 monitors. In the 1950s, the first electronic CO2 monitor was developed, utilizing novel infrared sensors to measure CO2 levels accurately. These advanced CO2 monitors quickly gained popularity, particularly in industrial settings and laboratories where precise measurements were crucial.

The 1980s saw a significant shift in the use of CO2 monitors from industrial settings to commercial and residential buildings. This change was driven by increasing awareness of the dangers of high CO2 levels and the need for proper ventilation in enclosed spaces. As such, CO2 monitors became a crucial component of indoor air quality control systems, helping to ensure the safety and comfort of occupants.

Nowadays, CO2 monitors have reached a new pinnacle of technological advancement. With the incorporation of data logging capabilities, automated calibration, and sophisticated alarm systems, CO2 monitors are capable of analyzing and monitoring air quality trends over extended periods. Additionally, the popularity of the internet of things (IoT) has enabled CO2 monitors to integrate seamlessly with building management systems, allowing for precise control of indoor air quality.

In conclusion, the history of CO2 monitors is a testament to the constant evolution of technology and the importance of ensuring safe and healthy environments. From its humble beginnings to its current state of sophistication, CO2 monitors have proved to be an invaluable tool that has transformed the way we manage indoor air quality.

One key choice in the design of the data logger described above is the use of a NDIR (non-dispersive infrared) sensor instead of an outdated chemosensor. This choice results in a more accurate reading of CO2 concentrations, as the NDIR sensor is not affected by temperature or other conditions that may compromise the accuracy of a chemosensor. This increased accuracy is beneficial for users who need to track CO2 concentrations for safety or environmental reasons, as they can have greater confidence in the data collected.

Another key choice in the design is the inclusion of both manual and automatic calibration options. While the manufacturer touts the convenience of automatic calibration, the choice to also include the option for manual calibration gives users greater control over the calibration process and may be preferred by those who require higher levels of accuracy or who work in environments where automatic calibration may not be possible. This choice ultimately empowers the user and allows them to customize the device to their specific needs.

Overall, these design choices result in a product that is more accurate, adaptable, and user-friendly. By prioritizing these factors, the manufacturer has created a device that can benefit a wide range of users, from environmental scientists to building managers, and can provide data that is both reliable and relevant.

FAQ About co2 monitor

Q: Which CO2 monitoring device is more accurate?

A: The accuracy of CO2 monitoring device depends on the type of sensor used. NDIR (non-dispersive infrared) sensors are considered to be more accurate as they can detect even low levels of CO2 emissions. However, the accuracy of a device also depends on its calibration process and the monitoring environment.

Q: Which air quality sensors are best?

A: The best air quality sensors are those that can accurately detect multiple air pollutants, such as CO2, VOCs, PM2.5, and humidity. Some popular sensors include the Purple Air PA-II, the IQAir AirVisual Pro, and the AirBeam2.

Q: What is the best indoor CO2 level?

A: The best indoor CO2 level is between 400-1000 ppm (parts per million). This is the ideal range for human comfort and productivity. Levels above 1000 ppm can cause drowsiness, headaches, and reduced cognitive ability, while levels above 5000 ppm can be dangerous for human health. It is recommended to maintain indoor CO2 levels below 1000 ppm for optimal air quality.


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