Sonoff-C AirGuard TH Pressure Zigbee Temperature, Humidity & Air Pressure Sensor | SNZB-02M
Sonoff-C AirGuard TH Pressure Zigbee Temperature, Humidity & Air Pressure Sensor | SNZB-02M
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Sonoff AirGuard TH Pressure Zigbee Temperature, Humidity & Air Pressure Sensor | SNZB-02M
The SONOFF AirGuard TH Pressure (SNZB-02M) is a small round Zigbee 3.0 sensor that measures temperature, humidity and air pressure. From these readings the app also calculates dew point and VPD, giving five values to monitor your indoor environment.
It is powered by a CR2477 coin cell with more than 2 years of battery life according to SONOFF, and can stand on a surface or attach magnetically to its adhesive metal plate.
Color: White
High-Precision Sensing: Temperature is measured to ±0.2°C, humidity to ±2% RH and air pressure to ±0.1 hPa (range 700–1100 hPa), so even small changes are captured.
5-in-1 Monitoring: Temperature, humidity and air pressure are measured directly, while dew point and VPD are calculated in the app. Dew point helps you spot condensation and mould risk; VPD is useful for plant growing.
Comfort Alerts & Automation: Set your own ranges for temperature, humidity and pressure and receive app notifications when a reading goes outside them. The sensor can also trigger fans, humidifiers, air conditioners or other smart devices automatically.
Who it's for / Works with: Anyone who wants pressure trends as well as temperature and humidity at home, in a greenhouse or a hobby room. SONOFF lists these Zigbee hubs: SONOFF ZBBridge-P, ZBBridge-U, NSPanel Pro and iHost (eWeLink app); Home Assistant via ZHA or Zigbee2MQTT with a SONOFF ZBDongle-P, ZBDongle-E, Dongle-M, Dongle-PMG24 or Dongle-LMG21; Aeotec SmartThings Hub (V3); and Amazon Echo (Plus 2nd Gen, Echo 4th Gen, Show 2nd Gen).
Good to know: A Zigbee hub is required. Indoor use only. Using it with ZHA currently needs a script from SONOFF's help center. Air pressure varies with altitude and location, so set the pressure comfort range for your own area.
What's in the Box
◆ SNZB-02M sensor
◆ CR2477 battery
◆ Metal mounting plate with 3M adhesive
Technical Specifications
| Specification | SNZB-02M |
|---|---|
| Product name | AirGuard TH Pressure (AirGuard series) |
| Model | SNZB-02M |
| MCU | EFR32MG22C224F512GN32 |
| Wireless | Zigbee 3.0 (IEEE 802.15.4) |
| Input | 3.0V ⎓ |
| Battery | CR2477 (over 2 years) |
| Temperature accuracy | ±0.2°C / ±0.4°F |
| Humidity accuracy | ±2% RH |
| Pressure accuracy | ±0.1 hPa |
| Operating pressure | 700–1100 hPa |
| Net weight | 27.3 g (with battery) |
| Dimensions | 45 × 45 × 17.6 mm |
| Casing material | PC |
| Application | Indoor |
| Operating temperature | -20°C to 60°C |
| Operating humidity | 5–95% RH, non-condensing |
| Certifications | CE, FCC, RoHS |
📄 User manual: Download the official SONOFF SNZB-02M user manual (PDF)