
Three Sonoff SNZB-02LD sensors with waterproof probes measure the temperature inside chilled counters, refrigerated display cabinets or freezers, while a thermo-hygrometer with display watches the room. The Sonoff ZB Bridge Pro sends the data to the eWeLink app: if the temperature rises above the threshold you get an alert on your phone straight away.
What it does
- Each Sonoff SNZB-02LD sensor has a waterproof probe that goes inside the fridge or the freezer, while the body stays outside, where the radio signal travels better.
- The Sonoff SNZB-02DR2 thermo-hygrometer with display shows the room's temperature and humidity and sends them to the app.
- The ZB Bridge Pro collects the data over Zigbee and brings it into the eWeLink app, with each sensor's history.
- If a display counter goes above the chosen threshold, after a fault or a door left open for example, you get a notification.
- The history shows when the temperature rose and for how long: useful for assessing the stock and for talking to the refrigeration engineer.

How it is installed
What's in the kit

| Qty | Item | Unit price | Subtotal |
|---|---|---|---|
| 1 | Sonoff ZB Bridge Pro Zigbee hubCoordinator / gateway | 33,99 € | 33,99 € |
| 3 | Sonoff SNZB-02LD waterproof probeClimate sensor | 24,63 € | 73,89 € |
| 1 | Sonoff SNZB-02DR2 thermohygrometer with displayClimate sensor | 15,28 € | 15,28 € |
| 1 | 5V 2A USB power supplies, 3 piecesAccessory: power · needed because the device comes without a power supply | 10,99 € | 10,99 € |
| Kit total | 134,15 € |
Prices taken from Amazon.it on 22/09/2026: they can change, and the price Amazon shows at the time of purchase is the one that applies.
Add the whole kit to your Amazon basket4 items, 6 pieces · optional extras are added from the individual linksDelivery, returns and warranty: Amazon shows these when you buy.
Before you order
Do you need a hub?
Yes, and it is included: the Sonoff ZB Bridge Pro. The sensors are Zigbee and talk only to the bridge, which joins the shop Wi-Fi. Without the bridge no data reaches the app.
Does the signal get out of the fridge?
Fridge walls shield radio signals heavily: that is why the SNZB-02LD sensor has a waterproof probe that goes inside, while the body with the radio stays outside. The bridge should still be kept a few metres away, not behind the compressors.
Does it work with Alexa and Google?
Yes, through the eWeLink app the Sonoff sensors reach Alexa and Google Home: you can ask for a cabinet's temperature by voice or use it in routines. History and notifications come from the eWeLink app.
Do you need an electrician?
No. The sensors run on batteries and fix with double-sided tape; the bridge is powered as the manufacturer describes. Neither the electrical nor the refrigeration system is touched: the probe passes through the door seal, with nothing to drill.
What happens if there is no internet?
The sensors keep measuring and the display in the room stays readable, but without internet the notifications do not reach your phone until the connection returns. That is why it pays to switch on the alert for a device going offline as well.
Does it replace HACCP record keeping?
It helps you keep them under control, because it keeps a temperature history, but it is not a certified instrument. The records your HACCP plan calls for must be kept as your HACCP consultant specifies.
Are batteries included?
The sensors are battery-powered; what comes as standard is stated on each product's Amazon listing. The charge level shows in the eWeLink app, so you know in advance when to change it.
What if a product is out of stock on Amazon?
It happens, above all with multipacks. Get in touch through the contact page quoting the kit code and the item that is missing: we will point you to an alternative that works with the rest of the set, so you can finish the order without changing the other parts.
Why buy on Amazon?
Purchase, payment, delivery, returns and warranty are handled by Amazon: delivery times, returns and warranty are shown on Amazon when you buy. The kit itself is our own work: we picked parts that work together, plus the accessories needed to fit them.
Notes
Not included
- Chilled counters, display cabinets and freezers
- A router and a Wi-Fi connection
- USB power supplies, if not included in the boxes
- HACCP records and paperwork
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