Sonoff AirGuard TH Lite Zigbee Temperature & Humidity Sensor

Description

Sonoff AirGuard TH Lite Zigbee Temperature & Humidity Sensor | SNZB-02B

Monitor temperature and humidity with exceptional accuracy using the Sonoff AirGuard TH Lite SNZB-02B, a compact Zigbee 3.0 smart sensor designed for reliable environmental monitoring throughout your home, greenhouse, storage area, or smart home setup.

Powered by a high-precision Sensirion temperature and humidity sensor, the SNZB-02B delivers fast updates every 5 seconds with an accuracy of up to ±0.2°C and ±2%RH.

But the AirGuard TH Lite goes beyond simply displaying temperature and humidity. It also provides valuable environmental insights such as Dew Point and Vapor Pressure Deficit (VPD), helping you identify condensation risks, manage humidity levels, protect valuable belongings, and create smarter automations.

Its slim, compact design makes it ideal for locations where larger sensors simply will not fit — from drawers and cupboards to guitar cases, humidors, wine storage and plant cabinets.

Key Features

High-Accuracy Temperature & Humidity Monitoring

The Sonoff SNZB-02B uses a precision environmental sensor to provide reliable readings for your smart home automations and monitoring.

• Temperature accuracy: ±0.2°C
• Humidity accuracy: ±2%RH
• Fast 5-second data updates
• Reliable monitoring for changing indoor conditions

Perfect for bedrooms, nurseries, living spaces, offices, storage areas and other environments where temperature and humidity matter.

Monitor Dew Point & VPD

The AirGuard TH Lite provides more than basic temperature and humidity readings.

Dew Point monitoring can help you identify conditions where condensation and excess moisture may become a problem, making it useful for protecting furniture, electronics, instruments and other sensitive items.

Vapor Pressure Deficit (VPD) provides valuable information for plant environments, helping growers and smart greenhouse users understand the relationship between temperature and humidity.

This makes the SNZB-02B an excellent choice for:

• Indoor plants and grow spaces
• Greenhouses
• Humidors and cigar storage
• Wine storage
• Musical instrument cases
• Jewellery and valuables
• Cupboards and storage areas
• Moisture-sensitive environments

Ultra-Compact Design for Tight Spaces

Measuring just 66.3 × 27.8 × 20 mm, the AirGuard TH Lite is designed to fit where larger smart sensors cannot.

Its slim profile makes it easy to place inside:

• Drawers and cupboards
• Guitar and instrument cases
• Humidors
• Wine racks
• Storage containers
• Plant cabinets
• Server and equipment cabinets

Use the included adhesive mounting option or hanging lanyard to position the sensor where you need it most.

Up to 2 Years of Battery Life

Powered by two standard AAA batteries, the SNZB-02B offers long-lasting wireless monitoring with up to 2 years of battery life, depending on usage and environmental conditions.

The use of standard AAA batteries also makes replacement simple and convenient.

Historical Data & Trends

Track changes in your environment over time with historical data available upto 6 months through the compatible platform.

Monitor trends in:

• Temperature
• Humidity
• Dew Point
• VPD

Historical data can help you identify patterns, troubleshoot environmental issues and optimise your automations.

Create Smarter Zigbee Automations

Pair the Sonoff AirGuard TH Lite with other compatible smart home devices to automatically respond to changing environmental conditions.

For example:

• Turn on a fan when the temperature rises
• Activate a dehumidifier when humidity becomes too high
• Switch on heating when temperatures fall below your preferred level
• Control ventilation based on humidity or Dew Point
• Automate grow lights or fans based on plant environment conditions
• Send notifications when temperature or humidity moves outside your chosen range

With Zigbee automation, your smart home can react automatically instead of requiring constant manual monitoring.

Zigbee 3.0 for Reliable Smart Home Integration

The SNZB-02B uses the Zigbee 3.0 protocol, offering low-power wireless communication and reliable smart home connectivity.

It requires a compatible Zigbee coordinator or gateway and is suitable for users building ecosystems with compatible platforms such as:

• Sonoff / eWeLink
• Home Assistant
• Zigbee2MQTT
• ZHA (currently requires installing a separate script/quirk)
• Other compatible Zigbee platforms

This makes it a versatile choice for both beginners and advanced smart home enthusiasts.

Perfect For Home Assistant & Smart Home Monitoring

The Sonoff AirGuard TH Lite is particularly useful when integrated into a smart home platform such as Home Assistant.

Use temperature and humidity data to create advanced automations, dashboards and notifications. Combined with smart plugs, relays, fans, heaters or dehumidifiers, the SNZB-02B can become part of a fully automated environmental control system.

Whether you are monitoring a bedroom, greenhouse, server cabinet or storage area, the sensor provides accurate environmental data for smarter decisions.

Technical Specifications

Why Choose the Sonoff AirGuard TH Lite?

The Sonoff SNZB-02B AirGuard TH Lite combines high measurement accuracy, fast reporting, long battery life and advanced environmental insights in a remarkably compact Zigbee sensor.

Unlike basic temperature sensors, it gives you additional information through Dew Point and VPD monitoring, making it useful for everything from everyday home comfort to plant care and protecting sensitive equipment.

Whether you’re building a Home Assistant smart home, expanding your Zigbee network, monitoring a greenhouse, or simply trying to maintain a more comfortable indoor environment, the AirGuard TH Lite gives you accurate data to make smarter decisions.

Note: A compatible Zigbee gateway or coordinator is required and is sold separately. Battery life may vary depending on usage, reporting frequency and environmental conditions.

*Up to 2-year battery life based on typical usage conditions.