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

I have over 20 YoLink devices and have been using them for years. They extremely reliable and very reasonably priced. The set up is very easy and their customer service is available and outstanding. Bottom Line: GREAT PRODUCTS AND GREAT CUSTOMER SERVICE

My wife was complaining that the temperature measurement reported by alexa was off. So I moved the sensor to the thermostat to see the difference and the temperature did not change. So I checked yolink app only to see that all devices were reported offline. Two door sensor, three temperature sensors, two garage door sensors, a water spill sensor, and the hub. Well, must be the hub, I thought, so I rebooted it. The hub and one temperature sensor came back. All the rest are still not reporting... UPDATE: So all the devices slowly updated themselves with yolink hub. My fault was that I did not check in the app to be alarmed when yolink hub goes offline. Now it is ON. A bit disturbing that the hub can go bizzerk while I am away and I can do nothing because it requires hard reboot. Otherwise all these units work good and I am glad I bought them. I wish they had more features.

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

Excellent item for warnings on coolers and freezers.

I have several of these units monitoring high and low temperatures. They work well, even when cold; they alert me when the freezer gets too warm. Alexa integration is lacking, however; you can’t trigger events in Alexa when the limits are exceeded. The in-app alerts work, but aren’t as flexible.

I like the compact size of the device. Its on the back deck right now, where the temperature is a cool 7.7 F. (at 8:40) and the YoLink says it was 1.4 F at 7:55 and that time difference makes it hard to know if the YoLink is correct. But, early this morning I did see it 0.2 F displayed on my phone, and the local weather station (down the street) recorded a low this morning of 0.6 F. So, I think its working pretty well. Before I put this outside on the deck, I noticed that changing from C to F or F to C, would instantly display the current temperature (on the LCD and the app). So, it can be forced to sample, display and send data to the app. The only negative I can see right now, is the slow sample rate that Im seeing when the sensor is outdoors. I can ask Alexa what is the temperature in the Prius and she says The Prius Temperature is 5.7 Degrees. But, I dont yet know how to create an Alexa routine that can trigger an action when the temperature is <= 5.0 F.. So, this sensor isnt very useful yet. Maybe I should see what IFTTT can do for me. ~~3/26/2023 I ordered a Yolink SpeakerHub. I can trigger a Yolink Routine when the temperature hits an alarm limit! I set the limit for 90F and put in a south facing window. When the sun comes bright, it gets up to 90F and commands my Yolink speaker to say (custom) Hey Google, turn on the Inverter. My Google Hub, controls Meross Outlet 120Vac switches. The switch named Inverter turns on, drives a relay that activates my 3000W Sine Wave inverter. The Alert Interval is set for 60 mins. (if the sun is still warm, we get a new Alert every hour). My Merross switch is set to run max run time of 65 mins. If it gets a restart every 60 mins, it keeps the inverter running until the sun is about to go down. My inverter is driven by a 48vdc battery bank, but when its charged, I can use the 800w solar panels to run some the loads in the basement. Freezer, Fios system, inhouse ethernet gear and a PlaneFinder tracking system. The main loads are the sump pumps. When the basement floods! Like we just had when all the snow melted. Both Alexa and Google speakers can work to control the solar inverter, Im using a Google speaker hub, because it was already installed near the Yolink Speaker Hub.

I have 7 of these that I use. All but one seem to function with good accuracy. I have one that seems to be off from other thermometers by almost 5 degrees at times. Overall a good product with pretty good reliability.

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.

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.

Temperature device works great. However, I have my existing THERMOSTAT set to reduce the temperature to 71 degrees Fahrenheit ONLY during sleeping time at night. So I would need to have EITHER 2 different TIMES OF THE DAY and TWO different Temperature settings; One for the day time when I dont need that room at 71 degrees Fahrenheit and one for sleeping time at night when I DO keep the bedroom at 71 deg.fah. Currently I have the Alarm setting giving me a warning every hour of the day...annoying unless I manually turn the Alarm OFF during the day an back on again during the night. But that kind of defeats the purpose of automation.