YoLink Smart Wireless Temperature & Humidity Sensor, Wide Temp Range (-22 to 158 Degree) for Freezer, Fridge, Green House, Pet Cage, Smartphone Alerts - Hub Required

Very happy with this Yolink hub and freezer monitor. Easy to setup.

YoLink Smart Wireless Temperature & Humidity Sensor is really easy to setup. All I have to do is to launch the up, press on set, and scan the QR code.

Excellent item for warnings on coolers and freezers.

I was very surprised how easy this was to set up. It worked in honestly about 2 minutes. The long battery life is a huge plus, and its quite accurate after testing it against known conditions. About 10 minutes after opening the box Id already bought more. My only VERY small complaint is no dark-mode in the App. This works great with Google assistant. I use it so I can ask what the temp is outside and get a real answer, not one for my area code. It integrates into IFTTT quite nicely. The temperature sensors are -not- wifi connected, to be clear. The hub takes Ethernet or links to Wi-Fi, but, the sensors dont.

The YoLink temperature sensor is fantastic. We purchased three YoLink temperature sensors. We put one in the freezer, a second in the freezer of the main fridge, and a third in the freezer of the smaller fridge. The devices are rugged, accurate, compact, and even nice looking. Setup was incredibly easy. The app is great. We get phone notifications and emails (depending on my setup) if the temperature or humidity is above or below the range I set. It is particularly helpful if we leave the freezer door slightly open. We purchased these temperature sensors because of their excellent ratings to protect our foods and refrigeration appliances at home. Once, before we had these devices, we were traveling for a couple of weeks, and the fridge stopped working. Because we did not have these temperature sensors then, we did not know until we got home. The food had rotted and stank horribly. The whole house was smelly for days. We cleaned the fridge and had it repaired, but the smell never went away from the fridge, and we had to dispose of the fridge and buy a new one, which was a big expense. Customer service is excellent. We are very pleased with the YoLink temperature sensors. Since purchasing them, we bought other YoLink devices, including leaks sensors and motion sensors, and we like them all.

You can look up the current reading from the always-on LCD panel on the 2.5”x2.25” sensor as well as from the phone app with up to one-hour delay. The phone reading is updated only once an hour. There is no refresh button for force reading the current temp/humidity. If the recent phone display says “Recently update:” 08:00 AM, then that is all you can see on the phone until 08:59 AM. At 09:00 AM, the phone reading is updated to the 09:00 AM reading. The graph reading lags even more. The app graph gets updated with a one-hour lag. E.g. at 8 AM, you see the 7 AM reading on the graph. But, at 8:59 AM, you still see the 7 AM reading. At 9 AM, the graph gets updated with the 8 AM reading. Why one-hour lag? I don’t see the data “refresh” button in the app. There is a “refresh” button on the “Rooms” screen, but that seems only usable for refreshing the list of devices connected to the hub. The graph data logging is only once an hour on the hour and you cannot change it. The app display choices are hourly or daily, and temp or humidity. You would expect to be able to change the range of display time. But no, pinching the screen does not change the magnification. You can only scroll endlessly left or right in fixed scale day or hour mode to see the time span of interest. I am not sure what the app designer was thinking. Like other YoLink devices, the batteries are pre-installed and shipped turned ON! Depending on how long the device sat in the inventory, you can be receiving already or mostly spent batteries only good for immediate recycling. The temp sensor firmware is 0309.

I have two of these sensors, purchased mostly to monitor the fridge sensor. The first one had a faulty antenna, it fell out, so the range is quite poor. The other goes through batteries very quickly, its faulty in some way. Other than those two flaws they seem to work quite well.

Very easy set up. Allows me to see freezer temp on my phone. After the freezer door was left open twice, this will warn me long before Ive lost food due to thawing! Well worth the investment!

We own a small bakery/takeout restaurant and we purchased this to make sure our freezer stayed at the temperature. The product works really well. If the freezer door is open too long and the temperature goes up I receive an alert on my phone and an email. I called customer service to ask questions about setting up the alerts and they were very helpful. I was told that we can attach more sensors and we will be adding them for our other refrigerators/freezers. I think that cameras are in the works too and will be available soon.

Used for bearded dragon tank