SONOFF AirGuard TH Pressure Zigbee Temperature, Humidity & Atmospheric Pressure Sensor (SNZB-02M)

Take your indoor environmental monitoring to the next level with the SONOFF AirGuard TH Pressure (SNZB-02M). Upgraded from standard climate sensors, this advanced 5-in-1 device monitors temperature, relative humidity, and barometric air pressure, while calculating Dew Point and Vapor Pressure Deficit (VPD).

With precision Swiss and Bosch sensing hardware, low power consumption, and standard Zigbee 3.0 connectivity, the SNZB-02M is the ideal choice for sensitive indoor environments, mold prevention, indoor growing, weather tracking, and smart climate automation.

Key Features & Benefits:

• Comprehensive 5-in-1 Environmental Insights: Tracks three raw physical metrics—Temperature, Relative Humidity, and Barometric Air Pressure (700–1100 hPa)—and calculates Dew Point and Vapor Pressure Deficit (VPD). Gain a complete picture of room comfort, mold risk, and plant transpiration.

• Professional-Grade Measurement Accuracy: Powered by high-precision sensors delivering temperature accuracy of ±0.2°C (±0.4°F), humidity accuracy of ±2% RH, and air pressure accuracy of ±0.1 hPa.

• Barometric Pressure Tracking & Weather Tendency: Monitor subtle atmospheric pressure shifts in real time. Perfect for tracking microclimate changes, weather transitions, altitude compensations, or specialized lab and workshop conditions.

• Essential Tool for Plant Care & Indoor Growers (VPD): Vapour Pressure Deficit reveals how easily plants can transpire and absorb nutrients. By monitoring VPD alongside temperature and humidity, indoor gardeners can optimize greenhouse conditions for maximum plant health.

• Long-Lasting Battery Life (CR2477 Powered): Powered by a high-capacity 3.0V CR2477 coin cell battery, offering up to 2+ years of continuous operation under normal conditions without constant maintenance.

• Instant Threshold Alerts & Scene Linkage: Set customized comfort ranges for temperature, humidity, and barometric pressure. Trigger instant mobile push notifications when ranges are exceeded, or link scenes to automatically control smart plugs, exhaust fans, heaters, or humidifiers.

• Universal Zigbee 3.0 Compatibility: Connects to SONOFF Zigbee hubs (iHost, NSPanel Pro, ZB Bridge Pro, ZBDongle-E/P) as well as standard third-party hubs including Home Assistant (ZHA / Zigbee2MQTT), SmartThings Hub, and Amazon Echo with built-in Zigbee.

• Compact, Versatile Placement: With its clean, minimalist aesthetic and included 3M adhesive mount, you can easily place or mount the sensor in living rooms, bedrooms, nurseries, greenhouses, wine cellars, cigar humidors, or server cabinets.

Some features are exclusive to eWeLink (not natively exposed on standard Zigbee hubs like Home Assistant) include: automatic in-app Dew Point and VPD calculations, the visual 7-zone radar gating and interference auto-calibration tools for the SNZB-06P24, 6-month cloud historical data storage with CSV export, built-in comfort-threshold push alerts, and direct cloud-to-cloud Alexa/Google Assistant voice syncing.