Sonoff Zigbee AirGuard TH Pressure
Sonoff Zigbee AirGuard TH Pressure
Monitor Your Indoor Environment With Greater Precision
Get a clearer view of your indoor environment with the SONOFF AirGuard TH Pressure (SNZB-02M) — a compact Zigbee 3.0 temperature, humidity and atmospheric pressure sensor designed for smart-home environmental monitoring.
✔ 5-in-1 Environmental Monitoring
✔ High-Precision Temperature, Humidity & Pressure Detection
✔ Fast 5-Second Data Refresh
✔ Dew Point & VPD Calculations
✔ Over 2 Years of CR2477 Battery Life
✔ Smart Zigbee Automation
Monitor temperature, humidity and air pressure in real time while the eWeLink app provides Dew Point and VPD calculations for deeper environmental insight.
Important: A compatible Zigbee hub or coordinator is required.
Know What’s Happening in Your Environment
Temperature and humidity can change throughout the day, while air pressure can provide additional information about changing environmental conditions.
Basic sensors only give you individual readings. The SONOFF AirGuard TH Pressure combines temperature, relative humidity and atmospheric pressure monitoring in one compact device, then adds calculated Dew Point and VPD data through the app.
With readings refreshing every 5 seconds, customizable comfort alerts and smart automation support, you can monitor changing conditions and respond when your environment moves outside your preferred range.
Whether you're managing home comfort, an indoor garden, storage area, grow room or smart-home automation system, AirGuard gives you useful environmental data without adding a bulky monitoring device.
Why Choose the SONOFF AirGuard TH Pressure?
Choosing an environmental sensor is about more than simply measuring temperature.
The AirGuard TH Pressure combines:
High-precision temperature measurement with ±0.2°C accuracy
Humidity measurement with ±2% RH accuracy
Atmospheric pressure monitoring with ±0.1 hPa accuracy
Dew Point and VPD calculations through the eWeLink app
Zigbee 3.0 connectivity for smart-home integration
Over 2 years of specified battery life using a CR2477 battery
5-second data refresh for closer environmental monitoring
The result is a compact Zigbee environmental sensor designed to provide more useful information for everyday monitoring and automation.
Why AirGuard TH Pressure Compared to Basic Sensors
| Feature | SONOFF AirGuard TH Pressure | Basic Temperature/Humidity Sensor |
|---|---|---|
| Temperature | ✓ | ✓ |
| Humidity | ✓ | ✓ |
| Atmospheric Pressure | ✓ | Often unavailable |
| Dew Point | App calculated | Often unavailable |
| VPD | App calculated | Often unavailable |
| Data Refresh | Up to every 5 seconds | Varies |
| Zigbee 3.0 | ✓ | Depends on model |
| Smart Automation | ✓ | Depends on platform |
| Comfort Alerts | Temperature, humidity & pressure | Often limited |
| Battery | CR2477 | Varies |
The Difference You Notice Immediately
Monitor Three Key Environmental Conditions
Track temperature, humidity and atmospheric pressure from one compact Zigbee sensor.
Understand Dew Point & VPD
The eWeLink app calculates Dew Point and Vapor Pressure Deficit (VPD) from temperature and humidity readings, giving you additional environmental insight.
Capture Changes Faster
With data refreshing every 5 seconds, you can monitor environmental fluctuations more closely.
Receive Comfort Alerts
Set preferred temperature, humidity and pressure ranges and receive app notifications when configured limits are exceeded.
Automate Your Smart Home
Use environmental readings as triggers for compatible smart scenes, including fans, humidifiers, dehumidifiers, air conditioners and window openers.
Track Environmental Trends
SONOFF provides up to 6 months of free cloud storage for viewing temperature, humidity, air pressure, Dew Point and VPD trends.
Premium Features
| Feature | Benefit |
|---|---|
| 5-in-1 Environmental Monitoring | Monitor temperature, humidity, pressure, Dew Point and VPD |
| ±0.2°C Temperature Accuracy | Precise temperature monitoring |
| ±2% RH Humidity Accuracy | Reliable humidity tracking |
| ±0.1 hPa Pressure Accuracy | Detailed atmospheric pressure monitoring |
| 5-Second Data Refresh | Capture environmental changes more closely |
| CR2477 Battery | Over 2 years of specified battery life |
| Zigbee 3.0 | Reliable smart-home connectivity |
| Custom Comfort Alerts | Get notified when configured limits are exceeded |
| Smart Automation | Trigger compatible connected devices automatically |
| 6-Month Cloud Trends | Review historical environmental data in the app |
| Voice Assistant Support | Check supported readings through Alexa or Google via eWeLink integration |
| Apple Home Support | Integrate SONOFF Zigbee devices through supported Matter Bridge solutions |
How to Use the SONOFF AirGuard TH Pressure
Using the SNZB-02M is straightforward:
-
Insert the included CR2477 battery.
-
Pair the sensor with a compatible Zigbee hub or coordinator.
-
Add the device to the eWeLink app or a supported Zigbee platform.
-
Place the sensor in a suitable indoor location.
-
Monitor temperature, humidity and atmospheric pressure.
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View calculated Dew Point and VPD information where supported.
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Set comfort thresholds and app notifications.
-
Create compatible smart scenes based on environmental changes.
Note: The SNZB-02M does not connect directly to standard Wi-Fi. Third-party platform features can vary. SONOFF currently notes that ZHA use requires the relevant script.
Who Is It For?
The SONOFF AirGuard TH Pressure is ideal for:
Smart home owners
Home Assistant and Zigbee users
Indoor gardeners
Grow-room users
Greenhouse monitoring setups
Home climate monitoring
Wine cellar and storage monitoring
Workshop and equipment areas
Server cabinets and suitable indoor equipment spaces
Smart-home automation enthusiasts
Anyone who wants more detailed indoor environmental data
If temperature, humidity or environmental changes matter in your space, AirGuard provides the data needed to monitor conditions and build smarter automations.
Designed for Smarter Environmental Monitoring
The SONOFF AirGuard TH Pressure stands out by combining three measured environmental parameters with calculated Dew Point and VPD insights in one compact Zigbee sensor.
Its high measurement accuracy, 5-second refresh rate, customizable comfort alerts, long battery life and Zigbee 3.0 connectivity make it more versatile than a basic temperature or humidity sensor.
The completely wireless design also gives you flexibility when positioning the sensor on suitable indoor surfaces, shelves, corners or other locations where environmental monitoring is needed.
Specifications
| Specification | Details |
|---|---|
| Brand | SONOFF |
| Product Name | AirGuard TH Pressure |
| Product Series | AirGuard Series |
| Product Type | Zigbee Temperature, Humidity & Air Pressure Sensor |
| Model | SNZB-02M |
| MCU | EFR32MG22C224F512GN32 |
| Input | 3.0V DC |
| Battery | CR2477 |
| Wireless Connection | Zigbee 3.0 (IEEE 802.15.4) |
| Temperature Accuracy | ±0.2°C / ±0.4°F |
| Humidity Accuracy | ±2% RH |
| Pressure Accuracy | ±0.1 hPa |
| Pressure Range | 700–1100 hPa |
| Data Refresh Rate | Up to every 5 seconds |
| Operating Temperature | -20°C to 60°C |
| Operating Humidity | 5–95% RH, non-condensing |
| Environment | Indoor |
| Dimensions | 45 × 45 × 17.6 mm |
| Net Weight | 27.3 g including battery |
| Colour | White |
| Casing Material | PC |
| Certifications | CE / FCC / RoHS |
What's Included
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1 × SONOFF SNZB-02M AirGuard TH Pressure Sensor
-
1 × CR2477 Battery
-
1 × 3M Adhesive Mounting Solution
-
1 × Quick Start Guide
Important Compatibility & Usage Notes
Zigbee hub required: The SNZB-02M requires a compatible Zigbee hub or coordinator and does not connect directly to standard Wi-Fi.
Indoor use: Designed for indoor environments and is not waterproof. Keep the sensor away from rain, splashing water and direct wetting.
Platform compatibility: eWeLink and third-party Zigbee platforms can provide different features and available data. Always check your preferred platform's current compatibility.
Home Assistant: SONOFF currently notes that SNZB-02M use with ZHA requires the relevant script.
Voice assistants: Alexa and Google Home support requires the device to be added to eWeLink and synced through supported cloud-to-cloud integration.
Apple Home: Apple Home integration is available through supported SONOFF Matter Bridge solutions.
Pressure readings: Atmospheric pressure varies according to location, altitude and season. Pressure trends provide environmental information and should not be treated as a standalone weather forecast.
Frequently Asked Questions
Does the SONOFF SNZB-02M connect directly to Wi-Fi?
No. The SNZB-02M uses Zigbee 3.0 and requires a compatible Zigbee hub or coordinator.
What does the AirGuard TH Pressure measure?
It measures temperature, relative humidity and atmospheric pressure. The eWeLink app also calculates Dew Point and VPD from temperature and humidity data.
How often does the sensor update?
Environmental data can refresh every 5 seconds, allowing you to monitor changes more closely.
How long does the battery last?
SONOFF specifies more than two years of battery life using a CR2477 battery under its test conditions. Actual battery life depends on usage, firmware, network conditions and the environment.
Can I use it for indoor growing?
Yes. Temperature, humidity and calculated VPD readings make it useful for monitoring indoor growing environments.
Can I create smart-home automations?
Yes. Compatible environmental readings can be used to trigger smart scenes for devices such as fans, humidifiers, dehumidifiers, air conditioners and window openers.
Can I use it with Home Assistant?
Third-party Zigbee integrations are supported with feature availability depending on the platform and current software. SONOFF currently notes that ZHA requires the relevant script.
Can I use it with Apple Home?
Yes, SONOFF supports integration of its Zigbee devices into Apple Home through supported Matter Bridge solutions.
Take Control of Your Indoor Environment
Don't rely on basic temperature readings alone. The SONOFF AirGuard TH Pressure SNZB-02M combines accurate temperature, humidity and atmospheric pressure monitoring with Dew Point, VPD, smart alerts, Zigbee 3.0 automation and environmental trend tracking in one compact wireless sensor.
Whether you're improving smart-home comfort, monitoring an indoor garden, tracking storage conditions or building a more responsive automation system, AirGuard gives you the environmental data you need to make smarter decisions.
Add the SONOFF AirGuard TH Pressure to your Zigbee setup and start monitoring your environment with greater precision.
- Model: SNZB-02M (AirGuard TH Pressure); Product Type: Zigbee Temperature, Humidity & Air Pressure Sensor; Wireless: Zigbee 3.0 (IEEE 802.15.4); Battery: CR2477 3.0V; Temperature Accuracy: ±0.2°C / ±0.4°F; Humidity Accuracy: ±2% RH; Pressure Accuracy: ±0.1 hPa; Pressure Range: 700–1100 hPa; Refresh Rate: 5 seconds; Operating Temperature: -20°C to 60°C; Operating Humidity: 5–95% RH, non-condensing; Dimensions: 45 × 45 × 17.6 mm; Weight: 27.3 g including battery; Colour: White; Casing: PC; Application: Indoor.
Shipping & Returns
Processing time
Orders are processed within 1–3 business days (Monday to Friday, excluding public holidays). Processing time begins on the day you place your order.
Shipping Rates
| Service | Rate |
|---|---|
| Standard Shipping | $10 flat rate |
| Express Shipping | $15 flat rate |
| Expedited Dispatch | From $20, calculated at checkout |
| Free Standard Shipping | Orders over $129 (AU & NZ) |
International rates calculated at checkout.
Expedited Dispatch
Order before 2pm AEST Mon–Fri for same day dispatch via Express shipping. Orders placed after 2pm or on weekends dispatch next business day.
Returns
30-day return window from date of delivery. Items must be unused and in original packaging. Contact us to initiate a return — return address provided upon approval.
Warranty
All Dialedin products carry a 12-month warranty against manufacturing defects and failure. Consumables excluded.
For full details see our Shipping Policy and Return and Refund Policy
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