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The UNI-T A37 is a sophisticated and portable carbon dioxide (CO₂) monitor designed to help you maintain a healthy and safe indoor environment. In an era where air quality is paramount, this device provides accurate, real-time readings of CO₂ concentration, temperature, and humidity, empowering you to make informed decisions about ventilation .
Whether you are concerned about the air quality in your home, classroom, office, or any public space, the A37 offers a clear and immediate picture of your surroundings. It utilizes a maintenance-free NDIR (Non-Dispersive Infrared) sensor—the industry standard for accurate and stable CO₂ measurement . With its clear visual indicators, including an easy-to-understand emoticon face and a traffic-light color system, the A37 instantly communicates the quality of your air, prompting you to ventilate when necessary .
Accurate NDIR CO₂ Sensor: Employs a high-quality, non-dispersive infrared sensor for reliable and long-lasting CO₂ detection without the need for maintenance .
Comprehensive Air Quality Monitoring: Simultaneously measures and displays Carbon Dioxide (CO₂) concentration, Temperature, and Relative Humidity (%) on a large, easy-to-read screen .
Wide CO₂ Measurement Range: Detects CO₂ levels from 400 to 5000 ppm (parts per million), covering a broad spectrum from fresh outdoor air to poorly ventilated indoor spaces .
Intuitive Visual & Audible Alerts: Features a traffic-light color system and an emoticon face for at-a-glance air quality assessment. An audible alarm can be triggered when CO₂ levels become elevated, prompting immediate ventilation .
Built-in Rechargeable Battery: Powered by a convenient 1500mAh Li-ion battery that can be recharged via the included Micro-USB cable, ensuring continuous, cable-free operation .
Multi-functional Display: The backlit LCD shows CO₂ concentration, temperature, humidity, date, and time all on one screen for a complete environmental overview .
Advanced Monitoring Functions (Optional): Includes features like MAX/MIN recording, average value (AVG), 8-hour TWA, and 15-minute STEL for detailed exposure analysis in professional settings .
Compact & Portable: With its lightweight design (195g) and compact dimensions, it's easy to move between rooms or carry for on-the-go monitoring .
The UNI-T A37 delivers reliable and accurate data for a comprehensive understanding of your indoor climate.
| Function | Range | Resolution | Accuracy |
|---|---|---|---|
| Carbon Dioxide (CO₂) | 400 ~ 5000 ppm | 1 ppm | ±(5% of reading + 50 ppm) (400~2000 ppm) |
| Temperature | -10.0°C ~ 50.0°C (14°F ~ 122°F) | 0.1°C | Typically ±1°C |
| Relative Humidity | 0% ~ 99% RH | 1% RH | Typically ±5% RH (10%~90% RH at 25°C) |
| Specification | Detail |
|---|---|
| Sensor Type | NDIR (Non-Dispersive Infrared) for CO₂ |
| Update Interval | CO₂ value updates once every 3 seconds |
| Alarm Threshold | Audio and visual alarm when CO₂ concentration > 1000 ppm |
| Data Logging Functions | HOLD, MAX, MIN, AVG, TWA (8h), STEL (15m) |
| Display | Backlit LCD, 42mm x 65mm |
| Power Supply | Built-in 3.7V Li-ion rechargeable battery (1500mAh) |
| Charging | Micro-USB port (cable included) |
| Auto Power Off | After 2 hours of inactivity |
| Product Dimensions (W×H×D) | 75mm × 130mm × 55mm |
| Product Net Weight | 195g |
| Operating Conditions | 0°C ~ 50°C, 0% ~ 85% RH |
| Storage Conditions | -20°C ~ 60°C, 0% ~ 95% RH |
| Certifications | CE, UKCA |
| Item | Quantity |
|---|---|
| UNI-T A37 Carbon Dioxide Detector | 1x |
| Micro-USB Charging Cable | 1x |
| User Manual | 1x |
The A37 is designed to make understanding your air quality simple. By monitoring CO₂, which is a key indicator of ventilation, you can ensure a healthier environment. Here’s a general guide to CO₂ levels:
400-450 ppm: Typical outdoor air level.
450-1000 ppm: Good indoor air quality with adequate ventilation.
1000-2000 ppm: Poor air quality; drowsiness and stuffiness may occur. The A37 will typically trigger its alarm at 1000 ppm .
2000-5000 ppm: Very poor air quality; headaches, sleepiness, and stagnant air.
The A37 translates this data into two easy-to-understand visual formats:
Emoticon Faces: A smiling face for good air quality, a neutral face for moderate, and a sad/frowning face for poor air quality .
Traffic Light System: Green indicates good, yellow/orange indicates moderate, and red indicates poor air quality .
The large LCD screen simultaneously shows:
Current CO₂ concentration (ppm)
Current Temperature (°C)
Current Humidity (%RH)
Date and Time
Visual: Check the color bar (Green/Yellow/Red) and the emoticon face on the display for an immediate assessment .
Audible: An optional beeping alarm can be activated to sound when CO₂ levels exceed the pre-set threshold (1000 ppm), serving as a direct prompt to open a window .
Use the HOLD function to freeze the current reading on the display for convenient viewing .
Access the MAX and MIN values to see the highest and lowest CO₂ levels recorded since the last reset .
The A37 includes advanced functions for workplace safety:
TWA (Time Weighted Average): Calculates the average CO₂ exposure over a standard 8-hour work shift.
STEL (Short-Term Exposure Limit): Calculates the average exposure over a 15-minute period, useful for spotting dangerous short-term peaks .
The internal Li-ion battery provides cordless operation. When the battery is low, an icon will appear on the display, prompting you to recharge via the included Micro-USB cable .
The UNI-T A37 is a versatile monitoring tool ideal for:
Recommended by the ProjetCO2 group for classrooms to demonstrate the importance of ventilation and limit the spread of airborne contaminants .
Ensuring a healthy learning environment for students and teachers.
Monitoring air quality to maintain employee alertness, comfort, and productivity.
Identifying poorly ventilated areas like conference rooms and open-plan offices.
Keeping track of air quality in bedrooms, living rooms, and nurseries to ensure a healthy environment for your family.
Knowing exactly when to air out a room to reduce CO₂ buildup from occupancy.
Monitoring air quality in factories, laboratories, restaurants, and hotels to ensure a safe and comfortable environment for staff and customers .
The UNI-T A37 is highly regarded for its accuracy, ease of use, and clear visual indicators. One user praised it for providing accurate measurements with a simple operation .
Effective & Accurate: Users find the device easy to use and trust its readings .
Intuitive Interface: The emoticon face and traffic light system are frequently mentioned as being very helpful for quickly understanding air quality .
Comprehensive Data: Having temperature and humidity displayed alongside CO₂ provides a complete picture of the indoor environment.
CO₂ Accuracy Range: The highest precision (±5% rdg + 50ppm) is guaranteed within the 400-2000ppm range, which is the most critical zone for indoor air quality .
Charging Required: As a device with a built-in battery, it requires periodic charging, which is managed via the included USB cable .
The UNI-T A37 is more than just a CO₂ meter; it is a comprehensive indoor air quality monitor that puts the health of your environment front and center. Its combination of professional-grade NDIR sensor technology, intuitive visual indicators, and practical features like a rechargeable battery and advanced data logging make it an invaluable tool for any home, school, or office.
Whether you are a concerned parent, a facility manager, or an educator, the A37 provides the clear, actionable information you need to ensure safe, well-ventilated, and healthy indoor spaces. It's a small investment for the well-being of everyone who shares your environment.
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