SONOFF SNZB-02D
Thermometer and hygrometer with display (Zigbee)
A small sensor for every room: temperature and humidity on the display and on your phone. Also works as an external sensor for radiator valves.
Compatibility
ZHA ✓Z2M ✓Alexa ✓Google Home ✓
Cheap and accurate. The most common sensor in Home Assistant and SONOFF homes. How we rate
About the product
The SONOFF SNZB-02D is a small thermometer and hygrometer with a display. Put it on a shelf or stick it to a wall and you see temperature and humidity on the display and on your phone, with history.
What it does
- Accurate readings: ±0.2 °C and ±2% relative humidity, refreshed every 5 seconds.
- Display showing temperature and humidity, switchable between °C and °F.
- History and export in the app, useful for keeping an eye on humidity in a bathroom or cellar.
- An external sensor for radiator valves (such as the SONOFF TRV-ZBT Gen2), so heating follows the room temperature, not the radiator.
What you need
It uses Zigbee 3.0, so it needs a Zigbee hub: a SONOFF bridge (which also adds Alexa and Google Home) or Home Assistant. In Home Assistant it works with ZHA and Zigbee2MQTT.
Watch out for
Without a hub it will not reach your phone. If you want one in every room, the 2- or 4-packs are better value.
Who it is for
Anyone who wants to track temperature and humidity across the house, or heat by the real temperature in each room.
Photos: seller on AliExpress.
Where to buy
-
AliExpress
usually the lowest price, from China, in stock
Go to shop€10.03
price as of 14/11/2026
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Price history
Price tracked since 14 November 2026. The chart appears once we have a few weeks of data.
Pros
- +Around €10
- +Accuracy ±0.2 °C and ±2% humidity
- +Works with ZHA and Zigbee2MQTT
Cons
- −Needs a Zigbee hub
- −Better value in packs of 2 or 4
Specifications
| Protocol | Zigbee 3.0 |
|---|---|
| Accuracy | ±0.2 °C, ±2% RH |
| Display | yes, LCD |
| Refresh | every 5 s |