SwitchBot IP65 Indoor Outdoor Hygrometer Thermometer Wireless 3Packs, 100m Bluetooth Range, Refrigerator Thermometer, Dewpoint/VPD/Absolute Humidity Sensor, 2-Year Battery Life, Free Data Storage

Really all I needed was a replacement for a simple, broken outdoor thermometer but I saw these SwitchBot devices on Amazon at a very affordable price. Even more affordably you can get a box of three for around £20 so I went for this option. They come with AAA batteries pre-installed (estimated lifetime 2 years) and a specified operating temperature of -20C to 60c although ‘best between 5C and 50C’. The instruction manual was probably designed for the Queen’s Dolls’ House but is fairly easy to follow with a Q code for setting up the app on iOS or Android. Connectivity is via Bluetooth which should provide adequate coverage but needs a bit of experimentation if, like me, you have an old house with very solid walls.So why a ‘weather geek’? Well what I didn’t appreciate when I bought the devices was the remarkable amount of data they not only provide but also store. They measure temperature and humidity about every 15 minutes and store these measurements internally so that on your phone you can get the current readings immediately for all thermometers or within a second or two your can see on a graph how the measurements have changed over the past hour, day, week or year. These data can also be exported as csv files. I haven’t tried that at yet - and probably won’t. Even mor geeky the devices compute and display such things as Dew Point and Vapour-pressure Deficit which can be a gripping topic at any dinner table.Better still for the real geek, a few more pounds will buy a SwitchBot Hub Mini which puts the Bluetooth readings onto your server so that they can be viewed remotely: handy if you can also control your Central Heating remotely, as I am able to do although not via one of the many SwitchBot additional tools.

Very pleased with these temp & humidity sensors. Great that the data is viewed on the phone where I want it. They feel of very good quality, look nice, and are conveniently small.With the three-pack I bought, one of them wouldn’t update the software (several tries, the update got stuck part way through, then a “failed” message displayed), so I deleted it from the SwitchBot app and added again to the app, and it then updated with no problems. The other two updated perfectly first try.I keep one in the car, it is interesting to see the track of the range of temperatures in such an environment. Others are around the house. Bluetooth connection is ok, but of course is sensitive to walls etc being in the way. It would be handy to have one in the greenhouse - something I may look to do.

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.

This is a great little device at a bargain price. It uses 2 AAA batteries which come pre-installed and are estimated to last 2 years. The app is easy to use and shows current temperature and humidity (as well as some other measurements) plus is able to store thousands of readings which are displayed graphically. I was also able to successfully upgrade the device's firmware using the app.Connectivity is via Bluetooth and in my case I am using the device outdoors and needed to have it placed quite close to the house in order to establish a connection but then I live in an old house with very solid stone walls.I can't comment on the humidity readings but the temperature readings certainly appear to be accurate.All in all, I'm very pleased with the device and recommend it.

We were getting worried about humidity levels in our house, after having some issues with mould, so invested in the pack of three of these sensors that came with a handy hub that meant we could monitor them through the Internet on our phones.The sensors and hub were easy to set up. Wireless range wasn't too bad and the hub has been placed in a central location where it can reach all of them. The app works well and has allowed us to monitor the humidity in the loft and a couple of other rooms in the house. It's allowed us to track the effectiveness of various approaches to improve ventilation and we've since invested in some decent dehumidifiers to keep moisture levels down in problem spots.Given how relatively cheap and easy these were to set up, I think it would be very easy to go down the whole rabbit hole of home automation. I'm tempted to buy a couple of more sensors to expand the system.