Smart temperature and humidity sensor, ZigBee 3.0, LCD display Gen2, SNZB-02DR2, SONOFF

SONOFF AirGuard TH SNZB-02DR2 – Professional Indoor Climate Monitoring with a Large Smart Display

Maintaining the right indoor temperature and humidity is essential for comfort, health, and protecting valuable belongings. The SONOFF AirGuard TH SNZB-02DR2 combines precise environmental monitoring with intelligent smart-home integration, giving you instant access to climate data through a large 3.6-inch LCD display and the eWeLink ecosystem. Whether used in living spaces, offices, greenhouses, wine storage areas, nurseries, or hobby rooms, AirGuard TH helps you understand and optimize indoor conditions with professional-grade insights.

More than a standard temperature and humidity sensor, AirGuard TH provides historical analysis, remote monitoring, smart automation support, and advanced environmental calculations such as dew point and VPD. Its ability to display data from compatible SONOFF sensors, combined with customizable reporting intervals and voice query support through major smart-home platforms, makes it a powerful solution for users who want detailed climate information without complexity.

Key Features

• Large 3.6" LCD Display with Comprehensive Environmental Data
  View real-time temperature and humidity readings, 24-hour minimum and maximum values, and linked remote sensor information simultaneously on a large, easy-to-read display.
• App Monitoring and Advanced Climate Analysis
  Monitor environmental conditions remotely through the eWeLink app when connected to a Zigbee gateway. Access up to six months of historical records, including maximum, minimum, and average trends, along with dew point and VPD analysis for deeper air-quality insights.
• Remote Temperature Comparison Across Multiple Rooms
  In Zigbee mode, the sensor can link with compatible SONOFF SNZB-02, SNZB-02P, SNZB-02WD, SNZB-02D, and SNZB-02LD devices, allowing temperature readings from other locations to be displayed directly on the AirGuard TH screen.
• Smart Home Automation for Comfort and Efficiency
  Create intelligent scenes that automatically control humidifiers, air conditioners, fans, and other compatible devices based on measured temperature and humidity levels.
• Customizable Reporting Frequency
  Configure data reporting intervals according to specific thresholds or scheduled cycles, ensuring updates are delivered exactly when they are needed.
• Professional Dew Point and VPD Monitoring
  Generate quantitative environmental data using dew point and Vapor Pressure Deficit (VPD) calculations, helping users make informed decisions for plant growth, air quality management, and indoor climate control.
• Voice-Assisted Climate Monitoring
  After integration with compatible smart-home ecosystems, environmental information can be accessed through supported voice assistants for greater convenience.
• Zigbee Connectivity for Reliable Communication
  Utilizes energy-efficient Zigbee technology to deliver stable wireless connectivity and seamless integration with SONOFF Zigbee gateways and smart-home systems.

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

AirGuard Series Comparison

Technical Specifications

Frequently Asked Questions (FAQ)

1. What does minimum resolution mean? What is the minimum resolution of the AirGuard TH?

The smallest measurable change that causes the displayed value on the AirGuard TH to update. Simply put, it refers to how many decimal places the screen data is precise to.

As for AirGuard TH:

• Temperature: 0.1°C / 0.1°F
• Humidity: 1% RH on display; 0.1% on app

2. What does accuracy mean? What's the Accuracy of AirGuard TH?

Accuracy refers to the maximum deviation between the measured value and the true value.

As for AirGuard TH:

• Temperature: ±0.2℃ (-20~60℃)
• Humidity: ±2%RH (0~100%RH)

3. What's the default reporting interval and reportable change? How can I adjust it?

• Temperature reportable change: default ±0.2℃, range ±0.2~±1℃
• Humidity reportable change: default ±1%RH, range ±1%RH~±5%RH

If there's a change in value, the default reporting interval is 5s and the adjustable range is 5s~1h.

4. Does it support use on open-source platforms?

Yes. For example, with Home Assistant, you can pair the device using Dongle Series and add it via ZHA or Zigbee2MQTT (Z2M).

Please note that currently you need a script to add it to ZHA. Please check the instruction and the script at SONOFF Help Center.