SONOFF AirGuard TH Pressure Zigbee Temperature Humidity Air Pressure Sensor | SNZB-02M
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【5-in-1 Environmental Monitoring】Monitor temperature, humidity, and air pressure while the app calculates Dew Point and VPD for a complete view of your environment.
【High-Precision Detection】Accurately measures temperature (±0.2°C), humidity (±2%RH), and pressure (±0.1 hPa) to capture even the smallest environmental changes.
【Over 2 Years of Battery Life】 Powered by a CR2477 battery, it delivers more than 2 years of maintenance-free operation. Its completely wireless design allows flexible installation almost anywhere, including ceilings, corners, shelves, windows, or other hard-to-reach spaces.
【Instant Comfort Alerts】Set your preferred temperature, humidity, and pressure ranges. Receive instant app notifications whenever readings exceed your limits, helping you react quickly.
【Smart Zigbee Automation】Supports Zigbee 3.0 for broad compatibility. Automatically control fans, humidifiers, air conditioners, or window openers based on real-time environmental conditions — creating a healthier, more comfortable indoor climate without manual intervention.
Technical details, troubleshooting or setup tips? Access the SNZB-02M knowledge center for all the info you need.
Your Mini Home Environment Monitor
Zigbee Temperature Humidity Air Pressure Sensor | AirGuard TH Pressure
5-in-1 Environmental Monitoring
Real-time monitoring of five environmental indicators. Check the current status remotely anytime, anywhere through the app.
Accurately monitors changes in temperature, humidity, and air pressure. Data refreshes every 5 seconds, making it easy to capture subtle environmental fluctuations.
Understand Weather Changes Before They Happen
Air pressure trends can help you better understand changing weather conditions and prepare ahead of time.
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*Air pressure trends provide general weather insights and should not be considered a weather forecast.
Hidden Threats You Can Now Monitor
Supports dew point and VPD monitoring, turning invisible environmental threats into visible data.
Say goodbye to moldy walls—start by monitoring the dew point.
Stop guessing, start measuring—VPD is the grower's true compass
Over 2 Years of Battery Life
Powered by a high-capacity CR2477 coin cell battery, the device delivers over 2 years of battery life, reducing the need for frequent battery replacement.
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*The battery life data is a theoretical value, obtained from SONOFF's internal laboratory under a specific test environment. Actual use may vary slightly due to product differences, firmware software versions, operating conditions, and environmental factors. Please refer to the actual use.
Triple-Parameter Comfort Protection
Supports customizable comfort ranges for air pressure, temperature, and humidity.
When any parameter exceeds the preset threshold, the app instantly sends a notification.
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*Atmospheric pressure varies by location, altitude, and season. Higher elevations typically have lower pressure than
sea-level areas. Comfort ranges can be customized to suit your environment.
Your Home Responds Automatically
Automatically turn on a fan, dehumidifier, or custom smart scenes based on temperature, humidity, and pressure changes.
Enjoy up to 6 months of free cloud storage – view trends of temperature, humidity, air pressure, dew point, and VPD anytime,
and gain a more complete understanding of your environment.
Hands-Free Voice Commands
Compatible with major smart voice assistants— ask Alexa or Google, and you’ll get an instant update on the temperature and humidity.
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*Note: This function requires adding the device to the eWeLink app and syncing it to third-party platforms via cloud-to-cloud integration;
This process does not involve direct connection to the third-party gateway.
Works with Apple Home Via Matter Bridge
All solutions integrate SONOFF Zigbee devices into your Apple ecosystem via Matter Bridge, enabling seamless interconnected device control.
Learn More about ZBBridge-U | Learn More about eWeLink CUBE
Easily Integrates with Open-Source Platforms
Built on the Zigbee 3.0 standard, this device effortlessly connects with a wide range of third-party platforms.
*Currently, using the SNZB-02M with ZHA requires the script. For detailed instructions, please refer to: SNZB-02M knowledge center
Zigbee Hub Compatibility
CR2477 Battery Included
Specs & User Manual
SNZB-02M is a Zigbee temperature, humidity, and air pressure sensor designed to provide accurate environmental monitoring for smarter home automation. It measures temperature, humidity, and air pressure while the app also calculates Dew Point and VPD for deeper environmental insights. Featuring high-precision sensing, over 2 years of battery life, customizable comfort alerts, and Zigbee 3.0 compatibility, SNZB-02M can automatically trigger connected devices based on real-time conditions, helping you maintain a healthier, more comfortable, and energy-efficient indoor environment.
User Manual (PDF)AirGuard TH Pressure
AirGuard Series
Zigbee Temperature Humidity Air Pressure Sensor
SNZB-02M
EFR32MG22C224F512GN32
3.0V⎓
CR2477
Zigbee 3.0 (IEEE 802.15.4)
27.3g (including battery)
White
45 × 45 × 17.6mm
PC
Indoor
-20°C ~ 60°C
5-95%RH (non-condensing)
700-1100 hPa
±0.2°C/±0.4°F
±2% RH
±0.1 hPa
CE/FCC/RoHS
FAQ
1. What is air pressure monitoring used for?
Air pressure tracking helps you predict weather trends and adjust indoor temperature, humidity, and ventilation for a more comfortable living space.
It also helps maintain stable, suitable conditions for reptile care, plant cultivation, and wine storage. Beyond that, steady air pressure contributes to better everyday comfort in your home.
2. How can air pressure be used to predict weather changes?
- Steadily rising pressure: Weather is likely to become clearer, with a lower chance of rain.
- Steadily falling pressure: Cloudy, rainy, or windy conditions may be approaching.
- Rapid pressure drop (e.g., more than 2–4 hPa within 3 hours): May indicate an incoming cold front, heavy rain, or strong winds.
- Little or no pressure change: Weather conditions are likely to remain stable.
Note: Barometric pressure varies with location, altitude, and season. For more accurate weather forecasting, pay attention to your local baseline pressure and the rate of pressure change over time rather than the absolute pressure value alone.
3. How do I view Dew Point and VPD history?
Dew point and VPD are calculated based on temperature and relative humidity.
You can view the dew point and VPD curves on the History Record page.
If the Dew Point and VPD curves are not shown in the History Record, tap the gear icon in the upper-right corner to open Settings. Then tap the “+/-” icon next to each data type to show or hide the corresponding curves, including Temperature, Humidity, Air Pressure, Dew Point, and VPD.
4. What is the battery life of the SNZB-02M?
The SNZB-02M is powered by CR2477 battery. Battery life varies based on usage and environmental conditions but typically lasts 2 years. To maximize battery life, ensure the sensor is within range of your Zigbee hub to minimize communication retries.
5. Can it be used outdoors?
SNZB-02M is not waterproof, and we do not recommend using it outdoors in an environment where it is easily wetted by water.