Updated November 2026
Data from the official Sonoff site.
2026 verdict
A barometer against an on-device screen: the Sonoff SNZB-02WD edges out the Sonoff SNZB-02M AirGuard TH Pressure Sensor because the reading lives on the unit and the shell survives a damp room.
The Sonoff SNZB-02WD has an LCD and an IP65 rating, so it suits a greenhouse, a garage or a bathroom. The Sonoff SNZB-02M AirGuard TH Pressure Sensor answers with a third channel, barometric pressure, which the app turns into dew point and VPD, and it runs on a CR2477 rated for over two years. Pick the Sonoff SNZB-02WD when the number has to be visible and the spot can get wet, and the Sonoff SNZB-02M AirGuard TH Pressure Sensor when pressure data and derived dew point are the reason you are buying.
Connectivity
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Connectivity
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| Feature | Sonoff SNZB-02M AirGuard TH Pressure Sensor | Sonoff SNZB-02WD | Winner |
|---|---|---|---|
| Rating | 3.8 | 4.3 | Sonoff SNZB-02WD |
| Screen | NO | YES | Sonoff SNZB-02WD |
| Sensors | Temperature, Humidity, Atmospheric Pressure | Temperature, Humidity | Sonoff SNZB-02M AirGuard TH Pressure Sensor |
| Price | $19.90 | $19.90 | Tie |
| Warranty | 2 years | 2 years | Tie |
| Connectivity | Zigbee | Zigbee | Tie |
| Integrations | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Tie |
| Alerts | Temperature Alerts, Humidity Alerts, Low Battery Alerts | Temperature Alerts, Humidity Alerts | Tie |
| Local Control | YES | YES | Tie |
What the differences mean
The third reading
The Sonoff SNZB-02M AirGuard TH Pressure Sensor measures barometric pressure and the app derives dew point and VPD from it. The Sonoff SNZB-02WD reads temperature and humidity only, with no pressure channel of its own.
Screen
The Sonoff SNZB-02WD has an LCD, so its temperature and humidity can be read on the device. The Sonoff SNZB-02M AirGuard TH Pressure Sensor has no screen, so its readings, including pressure, exist only in an app or a dashboard.
Where it can live
The Sonoff SNZB-02WD is IP65 rated for damp and sheltered outdoor spots. The Sonoff SNZB-02M AirGuard TH Pressure Sensor carries no weather rating and is specified for indoor use.
Battery
The Sonoff SNZB-02M AirGuard TH Pressure Sensor runs on a single CR2477 rated for over two years, a thicker cell that is harder to find as a spare. The Sonoff SNZB-02WD uses the same CR2477, but no battery life is published for it.
Warranty and platforms
Both carry a two year warranty, so it does not separate them. Both reach the same platforms over Zigbee, with Apple Home and Matter available through a Sonoff bridge.
Which one to buy if
- you need barometric pressure or dew point data
The Sonoff SNZB-02M AirGuard TH Pressure Sensor is the only one of the two with a pressure channel behind those derived figures.
- you want the reading visible without opening an app
The Sonoff SNZB-02WD has an LCD on the device; the Sonoff SNZB-02M AirGuard TH Pressure Sensor has no screen.
- the sensor goes somewhere damp
The Sonoff SNZB-02WD is IP65 rated, while the Sonoff SNZB-02M AirGuard TH Pressure Sensor is indoor only with no weather rating.
- you are building greenhouse or cellar automations
The pressure channel and the derived VPD make the Sonoff SNZB-02M AirGuard TH Pressure Sensor the better trigger for plant-stress or ventilation rules.
$19.90
- + Sensors: Temperature, Humidity, Atmospheric Pressure
- - Rating: 3.8 vs 4.3
- - Screen: NO vs YES
Winner
$19.90
- + Rating: 4.3
- + Screen: YES
- - Sensors: Temperature, Humidity vs Temperature, Humidity, Atmospheric Pressure
What owners say
Both groups praise how little effort it takes to get a Sonoff Zigbee sensor working, with pairing that Zigbee2MQTT and ZHA finish in minutes, and both value readings they cross-checked against instruments they already trusted. Sonoff SNZB-02WD owners single out the IP65 shell and the readings they can take in greenhouses, garages and bathrooms, and the magnetic battery door, while noting a reporting interval that feels slow and an uncommon CR2477-style cell to keep as a spare. Sonoff SNZB-02M AirGuard TH Pressure Sensor owners are the ones who wanted a barometer, valuing the pressure channel for weather shifts and VPD for growing spaces, and their complaints are that pressure is missing on some platforms and that the same CR2477 cell is hard to find.
Frequently Asked Questions
Which is better overall: Sonoff SNZB-02M AirGuard TH Pressure Sensor or Sonoff SNZB-02WD?
The Sonoff SNZB-02WD by the page ranking, because its screen and IP65 shell fit more rooms. The Sonoff SNZB-02M AirGuard TH Pressure Sensor is the better sensor when barometric pressure, dew point and VPD are what you need, so the right pick depends on whether the third reading or the display matters more.
What is the biggest difference between the Sonoff SNZB-02M AirGuard TH Pressure Sensor and the Sonoff SNZB-02WD?
The extra pressure channel against an on-device screen. The Sonoff SNZB-02M AirGuard TH Pressure Sensor adds barometric pressure, dew point and VPD but has no display, while the Sonoff SNZB-02WD has an LCD and an IP65 shell but reads only temperature and humidity.
Does the Sonoff SNZB-02M AirGuard TH Pressure Sensor have a screen?
No. The Sonoff SNZB-02M AirGuard TH Pressure Sensor has no display. All readings, including barometric pressure, are viewed in the connected app or smart home dashboard.
Is the Sonoff SNZB-02WD weatherproof?
Yes. The Sonoff SNZB-02WD carries an IP65 weather-resistance rating, which makes it suitable for greenhouses, garages, bathrooms and sheltered outdoor spots. The Sonoff SNZB-02M AirGuard TH Pressure Sensor has no weather rating.
Do both work with Zigbee2MQTT?
Yes. Both the Sonoff SNZB-02M AirGuard TH Pressure Sensor and the Sonoff SNZB-02WD are supported by Zigbee2MQTT. Note that the pressure value of the Sonoff SNZB-02M AirGuard TH Pressure Sensor is not exposed on every platform, with SmartThings reported as missing it.
Which one publishes a battery life?
The Sonoff SNZB-02M AirGuard TH Pressure Sensor, rated for over two years on a CR2477 cell. The Sonoff SNZB-02WD uses the same CR2477, with no battery life documented, and that cell is less common to keep as a spare.
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