SwitchBot WiFi Thermometer Hygrometer 3 Pack with Hub Mini, IP65 Indoor Outdoor Thermometer Wireless, Humidity/Temperature/Dewpoint/VPD/Absolute Humidity Sensor with Smart Alerts, Works with Alexa

Cheap and good, with excellent build quality
I have tried a few Bluetooth weather devices, and this Switchbot is the cheapest and best.Physically, its advantages over similar devices are that it uses standard batteries (2xAAA, supplied) rather than a semi-random type of button battery, and that it is demonstrably waterproof – it is a smooth white plastic box and the battery compartment lid has a seal round it. Also, the nylon hanging loop won’t rot and is better than a hole in the back meant to go over a hook or a nail.I was surprised, for such a cheap device, to find that it supports firmware updates, as there was a notification in the app on the first Bluetooth LE connection. It updated in a couple of minutes from v0.4 to v0.5 – an odd version number for a released product – and, as is almost always the case now, there was nothing to state what the update fixed or improved. But the facility is important. In fact, there were four firmware updates in three months and it is now at v0.9. The app is also updated every few weeks, and there is the option to try out beta versions.The Bluetooth signal is evidently good, and not entirely line of sight – I can transfer data into the app from a room about 60 feet away with the device slightly hidden round a corner of the house. From a window 30 feet away, the transfer speed roughly doubles.Caching is well implemented and only new readings are transferred unless you explicitly clear the cache from within the app; this greatly speeds up everything as the device quickly accumulates thousands of readings. When I got a new phone it took 20 minutes to transfer all the readings.Its accuracy is better than that of my Bresser weather station, which cost about five times as much but tends to underestimate temperatures.Another Switchbot advantage, although it gets puzzlingly low ratings in Google Play, is the app. It looks good unlike many similar apps, is simple to set up and use, and data export is easy – select a date range and readings are exported to a comma separated values file in a defined time step. Exporting a reading every minute gives a huge 1.7MB/month file, but exporting a reading every half hour amounts to 50KB/month.I can produce graphs very easily from the exported file – the large graph is an import into LibreOffice with two changes (graph size, and colour and weight of temperature line) – and the other two graphs show what Switchbot can display using its own facilities.I have doubts about the accuracy of the battery level stated by the app, as it remained at 100% for a long time and had only declined to 94% after three months. If taken literally that would mean new batteries would be only be required in late 2028, which is improbable.I find that weather data gathering managed by an app is better than using a weather station, the whole genre now looking outdated with clunky displays and locked-in data, and the Switchbot is an excellent data gatherer. If it could record barometric pressure as well as temperature and humidity, it would replace everything weather-related here. I use a second (ancient) Android phone to provide a semi-permanent display.A minor issue is that the instructions state that the temperature sensor is good to -20C, but the device is recommended only to be used at 5C or greater. It has been down to -4C, with whole days below 5C, and I have noted two missed readings in four months, which were both when the temperature was well above 0C.Most impressive was that I discovered a bug when exporting. I raised a ticket in the app; there was a comment about three days later that it was being “escalated to senior technical staff”, then after six days there was a fix! That speed of response is otherwise unheard of in my experience, where technical comments are often not even acknowledged.£15 (sometimes as low as £11) is an absolute steal for something which would have cost several times as much for the same functionality, less well implemented, a few years ago.

Fantastic Device
For me, this is a 5* product. I’ll get into why after I explain the 4*. One of the indoor / outdoor sensors in my pack of three unfortunately failed its firmware update out of the box and became bricked. Thankfully, support have been amazing and sending me a replacement. The process was little hassle. That being said, I feel out of principle I cannot give a 5* right now.The product itself is brilliant. Compact (actually smaller than I was expecting), which makes it unobtrusive and good to put in tighter spots or even inside things (a terrarium for example). Connectivity is excellent. No hub or even an app are needed for this, you can hook it straight into home assistant over bluetooth. However, the switchbot app is great and has a lot of useful functionality. One of my favourite things about this is that you can just use it or take it with you anywhere and check temp and humidity on your phone. I’m a bit of a data nerd so i’ve taken it to all sorts of different places in the short time i’ve had it.Accuracy is hard to gauge without a benchmark I know is 100%, which i don’t have. But I believe they are very accurate, and did my research before hand to make sure they would be. Having a number of these sensors, they seem to agree strongly with one another. Which is reassuring. The one thing I will mention, is that their time to adapt to a drastic change in temperature +-20 celsius is quite long. Perhaps 20 mins or maybe a bit more. This is no issue, as the accuracy is stellar. But for some others this may be a concern.Overall, i’d highly recommend these.

Używam czujników od dwóch lat i mogę jasno stwierdzić, że to świetne gadżety, działają bezproblemowo i do tej pory nie wymieniłem baterii ani razu. Leżą na zewnątrz i wewnątrz lodówki, zapewniając mi stały, wyraźny obraz temperatury i poziomu wilgotności. Pomiar jest precyzyjny i niezawodny. Polecam te produkty.

Voici quelques semaines que je l’ai installée sans problème.Il fait parfaitement son job, facile à utiliser.

good