SwitchBotIP65 Indoor Outdoor Hygrometer Thermometer Wireless 3Packs, 394ft Bluetooth Range, Refrigerator Thermometer, Dewpoint/VPD/Absolute Humidity Sensor, 2-Year Battery Life, Free Data Storage

I purchased this to track the temperature in a portable cooler while multi-day camping in 80+F weather. I'm using a Bodega battery powered cooler that reports its temperature on its control panel. Since the cooler's temperature sensor must be inside a cooler wall, I wanted to know what temperature the food at the top middle of the cooler was maintaining while camping.In testing the SwitchBot at the bottom of the cooler, its measured temperature agreed with the cooler's measurement after a long equilibration period of 1hr as the thermometer adjusted from 79F to 32F. The cool down time was measured from data recorded in the SwitchBot app. Overnight measurements averaged 32F in a range from 30-34F in perfect agreement with my expectation and the 32F set on the Bodega cooler.The SwitchBot app has a logging function for tracking temperature changes. The thermometer stores measurements until the app connects and downloads the stored data. It is not necessary stay connected to the bluetooth to track recent temperature history. I'm not sure how long 'recent' is but it seems long enough for my purposes.Overall, the app works well on my iPhone. It connects to BLE quickly and provides displays of up to 31 days. I am satisfied with the purchase for my use.The SwitchBot thermometer also agrees well with two other trusted thermometers at 78F without calibration. When I initially received the thermometer, I thought that the thermometer required calibration of up to 4-6F after a 30 min wait both at room temperature and with the suggested 30 min time. I left it overnight and the next morning noticed that I needed to eliminate that calibration to match my other thermometers. An equilibration time of 30 minutes might be appropriate for small changes in temperature, but a much longer equilibration is required for large changes. My thermometer does not require calibration.

These feel really great, especially for the price.The packaging is very well thought out, pull tabs everywhere you need them, etc. The actual build quality also seems fine, the shells feel robust and the battery cover has a gasket to keep moisture at bay. Batteries are included and pre-installed, just pull the little tab to turn it on.Functionality wise, Home Assistant will pick these up without any additional work as long as you have bluetooth enabled, so no need for hubs or apps.They expose three sensors, temperature, humidity, and battery. The listing shows stuff like dew point and VPD but these are just calculated, there's no special sauce on the device itself. The update rate is 4s, but the device has a decent amount of thermal mass so the measurements are slow to react to fast changes. This is normal for this class of sensor, but noting it in case someone wanted to use it for more precise stuff. I threw a sensor in my refrigerator and it dropped at around 10F/5m, to give you a sense of the reaction time.

We're using it to mostly monitor temperature and humidity of our garage. It works well. The graphs are useful and can be downloaded. It's doesn't support automations without a Switchbot hub. The lanyard makes it portable.

Game-Changer for Temperature Tracking!I absolutely love this smart thermometer! The setup was super easy, and the connection to the app was seamless. The readings are fast and accurate, and I really appreciate how the app keeps a log of all temperatures over time. It's especially helpful for tracking fevers with my kids — no more guessing or trying to remember past readings! The interface is clean and user-friendly, and I love that I can even export data to share with our doctor. This has become an essential tool in our home. Highly recommend

Go not work for my purposes. I bought these sensors to put in my incubators to ensure the temp & humidity was accurate for hatching. I have tested these sensors several ways and cannot get stable and consistent readings from them.After days of getting fluctuating and varied readings from these sensors I tried place all three sensors in the same incubator as closely together as possible and out of the way of the fan. After an hour they were still giving off three quite varied readings - 100.4, 103.1, & 99.7. Very frustrating because they advertise that the sensors are highly accurate.The app works quite well and the alerts are easy to setup and use - however what good are they if I don't know if I can even trust the sensor's reading?UPDATE: I contacted customer service about this issue. They recommended calibrating the sensors by the ice bath method. I was told to place the sensors in a plastic bag and submerge them in a bowl of half crushed ice and half water for 30 minutes - they should then show 32 degrees.I started this process at 3:28pm. As you can see in the attached pictures, each of the three sensors took a full hour or more to register 32 degrees. At 30 minutes they were registering from 35.1 to 36.7 degrees. It took the additional 30+ minutes to get all the way to 32 degrees.Once the sensors were down below 33 degrees I got quite a few "Hub offline" errors and had to repeatedly try to force the app to refresh the data.It seems that maybe these sensors are just very very slow to acclimate and do not perform well in too low or too high of temps, which is disappointing in an "outdoor" sensors.Makes me question how long it would take for a small change in temperature to register.Overall, these sensors do not appear as though they will be good for use in the incubators as they do not seem to be as accurate in the 95-105 degree range and they are very slow to acclimate which would cause delays in reporting an issue in temp fluctuation in the incubator.