SNZB-02LD: IP65 Zigbee temperature sensor with display and deported cable

Sauna, swimming pool, aquarium, refrigerator, freezer… Sonoff succeeds once again with its new Zigbee temperature sensor with display and deported cable that you can use in any environment in your home or garden.

Why does Sonoff SNZB-02LD have this price?

SNZB-02LD is an excellent quality/price compromise as it is a temperature sensor that can be installed in extreme conditions with its IP65 degree of protection. It can measure temperatures between -40°C to +115°C with its deported cable and you can read this temperature with its LCD display or through the interface of a compatible Zigbee hub.

Advantages and Disadvantages of the Sonoff temperature sensor

Sonoff SNZB-02LD sensor usage tutorial

Let’s discover the details of this Zigbee temperature sensor from Sonoff.

General characteristics of Sonoff SNZB-02LD

At Domadoo, a home automation e-commerce company where I have been working for more than a decade, we had the opportunity to receive Alex Xie, CEO of SONOFF, and I had told him about some devices that did not exist in the smart home world and that, surely, he would have his great success.

One of my recommendations should not have gone unnoticed.

My suggestion was a sensor that could measure temperatures in different environments such as a swimming pool, a refrigerator, a sauna, an aquarium, our garden and any other environment where temperatures can be very low or very high.

A device already existed which fulfilled this function and which, by the way, is having a worldwide success due to its installation flexibility with its deported cable which measures temperatures from -40 °C to +200 °C.

But I had told the Sonoff team that it would be interesting to additionally have a display to read the measured temperature in real time and that the electronics of the device could also withstand extreme conditions.

This means, for example, that we can install it outdoors even in winter, without having to insulate the sensor in a waterproof box and avoid this tedious task.

Maybe it was a coincidence or not, but Sonoff has launched exactly this device which is very useful.

As we can see, this device is white in colour, with dimensions of 62.8 × 58.5 × 21.8 mm on the electronics side and comes with a 1.5 m deported cable.

In addition, we have an instruction manual.

A pairing pin.

Velcro with adhesive.

And a cord for hanging, 2 options for easy installation.

It also incorporates a magnet, which allows it to be installed on metal surfaces such as a refrigerator or a piece of furniture, allowing it to be moved at any time.

This temperature sensor incorporates a 2.2-inch LCD display that allows you to read the measured temperature in real time, its battery level and connectivity indicator.

On the back we have the battery holder and this CR2477 battery is included with a battery life of 2 years, according to the manufacturer.

This device integrates a silicone ring at the end of the thread, ensuring a perfect seal on the back of the device and thus preventing water and dust penetration and, as the manufacturer indicates, it has an IP65 protection rating.

This means that you will be able to use it in your garden in both summer and winter or in any area with extreme conditions, knowing that it is also resistant to ultraviolet rays, which guarantees its durability even when exposed to direct sunlight.

And the black button is used to change the unit of measurement (from °C to °F or vice versa) and for pairing.

This SNZB-02LD sensor integrates Zigbee technology, so you will be able to use it with a Sonoff Zigbee hub.

Or universal hubs like Jeedom Luna.

And Home Assistant with ZHA or Zigbee2MQTT.

The electronic part of the sensor can be exposed to temperatures between -10 °C to +60 °C and a humidity level of 0 to 100 %.

The deported cable has a temperature sensor protected inside a stainless steel capsule and has a plastic coating, which allows it to be submerged in water and exposed to temperatures between -40 °C to +115 °C, which gives us great flexibility of use in different environments, as we will see below.

That is to say, you should evaluate the environment of use of each of the 2 parts, given that the electronic part can withstand less extreme conditions than the sensor’s deported cable.

How to link the Sonoff sensor SNZB-02LD

To pair the Sonoff SNZB-02LD sensor you must put your home automation hub in pairing mode.

At this point you should remove the battery protection and the sensor should automatically join the Zigbee network of your home automation hub.

If this is not the case, you can press the physical button inside the sensor for at least 5 seconds.

Until the wave icon starts flashing.

Ready, after a few seconds you should see your sensor available in the interface of your home automation hub, so now you will be able to follow the measured temperature from anywhere in the world.

How to install the Sonoff sensor SNZB-02LD

The temperature is measured at the end of the deported cable of the SNZB-02LD sensor.

This means that you can fix the electronic part in a holder and put the deported cable in the area where you want to measure the temperature.

For example, you can place the external probe inside the refrigerator while the electronic part remains on the outside. However, it is important to install it carefully to prevent the door from being improperly closed.

Interestingly, unlike other sensors that cannot withstand extreme temperatures, the electronic module of the Sonoff sensor can even be placed inside the refrigerator, as it operates at temperatures as low as -10 °C.

And in case you want to monitor the temperature of a freezer, you can consider other installation methods, such as inserting the cable deported from the back of this freezer.

This is the case for a user who has up to EUR 1 000 of meat and fish in his freezer and wants to be alerted in case of a technical problem with this freezer if the temperature rises abnormally in order to avoid having to throw this food away.

Another interesting example of use is to put the deported cable into a liquid, such as swimming pool water.

You can install the temperature sensor outside, either hanging from a bracket, fixed with velcro or with its magnet on a metal surface, and read the temperature from its display and install the sensor inside the water for accurate measurements.

A smart home user uses precisely this type of sensor with a deported cable to automate the filtration time of his pool thanks to important data such as the temperature of his pool water.

Of course, you can also imagine other use cases, such as in a wine cellar, a sauna, a jacuzzi, an aquarium, boiler water and much more.

Detailed functions of SNZB-02LD

Let’s take a look at the different functions available with this Sonoff SNZB-02LD sensor.

To begin with, “Battery” is the battery level in percentage, which lets us know when this battery needs to be replaced.

“Temperature” is the most important information of the device; it is how much the deported cable measures in real time. These measurements are sent periodically and immediately whenever there is a sudden change of more than 0.5 °C in temperature.

Of course, from the interface of your home automation hub you will be able to see a history of all these sensor measurements over time.

“Temperature units” allows you to switch between °C or °F units.

“Temperature calibration” allows you to modify the measured temperature in case you find that you have an inaccurate sensor measurement.

And “Link quality” is a very useful information to know if our SNZB-02LD sensor has a good communication range with our home automation hub or not.

We have already seen in detail how to analyse and improve this Zigbee link quality, so I recommend you to watch it if you are not yet the case.

Of course, the magic of a smart home is to be able to create different automations based on the temperature measured by the sensor.

I mentioned 2 examples: receiving an alert on the phone when the freezer temperature exceeds a critical value.

And also to have a defined period of activation of the pool filtration according to the weather conditions of our city and the measured temperature of the water of this pool.

But your imagination is your limit.

In short, this temperature sensor has unique technical details in the world, with its display, deported cable, built-in Zigbee technology and its IP65 protection rating, allowing it to measure temperatures in any environment.

And, as usual, Sonoff offers a new device at a very attractive price compared to other devices on the market, as the SNZB-02LD sensor is available for 21.99 euros.

Generally purchased together

Buy now your Sonoff IP65 Temperature Sensor