SONOFF SNZB-02LD – IP65 Zigbee Waterproof Temperature Sensor
Smart temperature monitoring for liquids, enclosed spaces and challenging environments.
The SONOFF SNZB-02LD is a versatile Zigbee 3.0 smart temperature sensor featuring a waterproof stainless steel probe, a clear 2.2-inch LCD display and an IP65-rated main housing.
Designed to measure temperatures in locations where conventional smart sensors may not be suitable, the SNZB-02LD uses a 1.5-metre external probe to monitor liquids, refrigerators, water tanks, aquariums and other enclosed spaces.
With support for compatible Zigbee hubs, the sensor can also provide remote temperature monitoring, historical data and smart home automation capabilities.
Key Features
- Waterproof Temperature Probe: Stainless steel probe allows temperature monitoring in liquids and difficult-to-reach locations.
- 1.5-Metre Probe Cable: Offers flexible positioning while keeping the main display conveniently accessible.
- 2.2-Inch LCD Display: Clearly displays the measured temperature in Celsius or Fahrenheit.
- IP65-Rated Main Housing: Provides protection against dust and water jets, making it suitable for humid and splash-prone environments.
- Wide Temperature Measurement Range: The external probe measures temperatures from -40°C to +115°C.
- Zigbee 3.0 Connectivity: Reliable, energy-efficient wireless communication with compatible Zigbee hubs.
- Smart Home Automation: Create temperature-based automations and alerts using supported smart home platforms.
- Historical Temperature Monitoring: Access and export up to 180 days of temperature records through the eWeLink app with a compatible gateway.
- Battery Powered: Uses a replaceable CR2477 battery, eliminating the need for permanent wiring.
Waterproof Probe for Versatile Temperature Monitoring
The SNZB-02LD features an external stainless steel temperature probe designed to measure temperatures in liquids and enclosed environments.
Unlike conventional temperature sensors that measure conditions around their main housing, the SNZB-02LD allows the probe to be positioned directly where temperature readings are required.
Its 1.5-metre cable provides additional flexibility, allowing the LCD display to remain outside the measurement area.
Ideal applications include:
- Aquariums: Monitor water temperature to help maintain suitable conditions for aquatic life.
- Water Tanks: Track stored water temperatures and identify unexpected changes.
- Refrigerators & Freezers: Monitor internal temperatures without positioning the main sensor inside the appliance.
- Greenhouses: Measure soil or water temperatures to support plant care.
- Home Brewing: Monitor liquid temperatures during suitable stages of brewing or fermentation.
- Pipes & Enclosed Spaces: Measure temperatures in areas that conventional sensors may struggle to access.
The external probe supports temperatures from -40°C to +115°C, making it suitable for a wide variety of domestic temperature monitoring applications.
Clear 2.2-Inch LCD Display
View temperature measurements instantly without opening a smartphone application.
The integrated 2.2-inch LCD screen provides a clear and convenient display of the temperature detected by the external probe.
Readings can be switched between Celsius and Fahrenheit to suit your preferences.
The display also includes battery and Zigbee connection indicators, helping you monitor the sensor’s operating status.
IP65 Protection for Demanding Environments
The SNZB-02LD features an IP65-rated main housing designed to provide protection against dust and water exposure.
This makes it particularly useful in environments where moisture, splashes or humidity may be present.
The waterproof external probe can be positioned in suitable liquids while the main housing remains securely mounted away from prolonged water exposure.
Important: The main sensor housing must not be submerged in water or exposed to high-pressure water jets. Although the external probe is designed for liquid temperature measurement, the main unit should be installed in a suitable protected location.
Smart Home Automation with Zigbee 3.0
The SNZB-02LD uses Zigbee 3.0 wireless technology to communicate with compatible smart home hubs and coordinators.
Once connected, temperature readings can be incorporated into automated routines that respond to changing conditions.
Example automations include:
- Receive a notification when aquarium water temperature falls below a selected threshold.
- Activate a compatible heating device when temperatures become too low.
- Switch on a connected cooling device when temperatures exceed a chosen limit.
- Monitor refrigerator temperatures and receive alerts when readings move outside your preferred range.
- Track water tank temperatures and automate compatible equipment.
Automation capabilities depend on the connected Zigbee hub, smart home platform and supported devices.
Historical Temperature Data & Remote Monitoring
When paired with a compatible SONOFF Zigbee gateway, the SNZB-02LD can provide temperature monitoring through the eWeLink application.
View historical temperature readings by day or month, helping you identify patterns and changes over time.
The system supports up to 180 days of historical temperature data, with options to review and export records for further analysis.
This is particularly useful for monitoring aquariums, refrigeration conditions, water tanks and other temperature-sensitive environments.
Zigbee Smart Home Compatibility
The SONOFF SNZB-02LD is compatible with a range of Zigbee 3.0 gateways and smart home systems.
Compatible SONOFF devices include:
- SONOFF ZBBridge-P
- SONOFF ZBBridge-U
- SONOFF ZBDongle-P
- SONOFF ZBDongle-E
- SONOFF iHost
- SONOFF NSPanel Pro
The sensor can also be integrated into Home Assistant and other compatible Zigbee smart home platforms using a supported Zigbee coordinator.
Compatibility and available features may vary depending on the selected gateway and software platform.
A compatible Zigbee hub or coordinator is required for smart connectivity and automation features.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | SONOFF |
| Model | SNZB-02LD |
| Product Type | Zigbee Waterproof Temperature Sensor |
| Wireless Protocol | Zigbee 3.0 |
| Display | 2.2-inch LCD |
| Probe Material | Stainless Steel |
| Probe Cable Length | 1.5 metres |
| Probe Temperature Range | -40°C to +115°C |
| Main Unit Operating Temperature | -10°C to +60°C |
| Temperature Accuracy | ±0.5°C |
| IP Protection Rating | IP65 (Main Housing) |
| Power Supply | 3V DC |
| Battery Type | CR2477 |
| Dimensions | 62.8 × 58.5 × 21.8 mm |
| Net Weight | 86.2g including cable |
| Housing Material | PC + ABS |
| Colour | White |
| Zigbee Hub Required | Yes |
What’s Included?
- 1 × SONOFF SNZB-02LD Zigbee Temperature Sensor with Waterproof Probe
- 1 × CR2477 Battery
- 1 × Hanging Rope
- 1 × Velcro Mounting Strip
- 1 × Reset Pin
- 1 × Quick Start Guide
Why Choose the SONOFF SNZB-02LD?
The SONOFF SNZB-02LD offers a practical solution for monitoring temperatures in locations where standard smart home sensors cannot easily operate.
Combining a waterproof external probe, clear LCD display and Zigbee 3.0 connectivity, it enables convenient temperature monitoring for everything from aquariums and water tanks to refrigerators and home automation projects.
Whether you’re building your first smart home or expanding an existing Zigbee system, the SNZB-02LD provides flexible temperature monitoring and integration with compatible automation platforms.
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