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

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 had a need to monitor 2 refrigerators and 1 new upright freezer. These fit the bill perfectly and at a great price as I purchased 3 of them. My first foray into LoRa technology, Im happy I chose these as I can view temp/humidity levels in all 3 units on my phone, and get alerts if they are out of a range I set for each device. As far as accuracy, I cannot report as I do not have a NIST-traceable standard in which to compare. As far as precision, the fact they are in close agreement speaks to that (see photo). Primary down side to these devices is that you need another app on your smart phone to view. Bottom line: Very good value and I would/will continue to buy as the need arises. Update: May, 2023 After a year using 3 of these, I can say with complete confidence that they are BULLETPROOF. They have been reliably monitoring 3 appliances with perfect continuity, reporting and alerting. I think the hub and LoRa technology makes all the difference as the handful of cheap WiFi smart thermometers keep dropping off the network and overall, just frustrating to use. The YoLink devices never drop out and I have confidence that I can monitor my appliances (and soon a room) while Im traveling. Im buying another today and perhaps more later. You cannot go wrong with the YoLink system.

I am using this product to monitor the temperature in my chicken coop. I really only care about cold temperature to prevent frozen pollo. I was able to set up a cold temperature alert that goes to my phone. There is no history though, in that if you lose WiFi to the device it registers no temperature until your WiFi is back. I thought it would record the temperature at the sensor and update the app when it came back online. It is great for the price. It only updates in hour intervals so if you want to monitor something more often I would suggest another product or possibly another app could poll the sensor more frequently.

Easy to set up with yo-link, works as expected. Good range and quality

Another essential device for remote monitoring, and takes seconds to add to an existing YoLink network. Has an easy to read local display, and is nicely living on the back wall of our vacation home fridge. Set the temp and RH limits on the app, and now I’ll know if the fridge fails or someone leaves the door open.

Heard a lot of negatives about the refrigerator I just bought freezing food in the fridge compartment when they set the dial to Recommended. I had the same problem and decided to get the temperature sensors from Yolink (I already own a number of their products). After installing it, the manufactures recommended settings was way off. I turned the fridge settings much lower and the freezer higher and after playing with the temperature controls, I got the temperatures to be perfect. Fridge stays between 34 and 38 degrees and the freezer between 0 and 5 degrees according the sensors and app. I even got a text one day when the temperature in the fridge went to 33 degrees since my app was set to notify when it gets below 34. I highly recommend these sensors

Great trends in the app.

I have purchased around 15 of these now to monitor various temperatures and I love them. Very accurate, easy to use, and connect with no issue. Yolink has many great products and is a great way to give you piece of mind with home monitoring.