YoLink X3 Temperature & Humidity Sensor, Supports App Real-Time Data Refresh, Alexa, IFTTT, Home Assistant Integration - YoLink Hub Required

A little expensive but useful if you wish to monitor the temperature of a room during a heat wave.

I bought two of these one to monitor temperature in my heated work shop and one to monitor the temperature in my heated garage. They are accurate and work from a long distance away. If someone leaves a door open or a heater quits and the temperature drops below my set point it will alert me which has worked great. The app has a tab to instantly update temperatures real time which is a great feature that the outdoor temperature sensors do not have.

works well and I can use it anywhere in the house.

Bought this (Model YS8006) as it was advertised to be more accurate than their previous one (Model YS8003) and had less error (RH 2% vs 3%). However, when it arrived, the calibration was way off compared to my NIST certified hygrometer. Putting it through the pure salt + distilled water and damp cloth calibration, this X3 model performed worse than the non-X3 model. And the X3 cannot be calibrated as it exhibited non-linearity (lower than normal at high RH and higher than normal at low RH so no offset value can correct for this). Tech support did not understand the technical issue and offered a canned response which showed they did not read my question. Don't waste your cash on this more expensive version.

Yolink products are rock solid. I started off with this single termperature/humidity sensor and quickly expanded to at least 20 other various kinds of sensors over the next few weeks.The sensors are easy to add to your network. You simply open the app, scan the QR code on the sensor, name it, assign a room and you’re done. Sensors are all hyper-responsive and battery life is incredible. The range is likewise great. My farthest sensor is in a chicken coup behind a huge barn several hundred feet away from the Yolink hub. Reception is still great.The automation options built-in are good. There’s room for improvement. For instance, I have a temperature sensor in my office that turns on an AC plug to my air conditioner. The only triggers I can use from my thermometer sensor are high and low temp alert. I define high temp as 75 and so AC kicks on at that threshold. That works well. But I want the air conditioning to turn off at another threshold, say 70 degrees. I would have to define my low temp alert as 70 in order to make that happen. That doesn’t really work for me for several reasons. I’d like to have a heater that kicks on at 55 degrees, for instance. I could do this with two sensors but that seems wasteful. So I’m looking to integrate with ITTT (If This Then That) service to do more finely grained automation. I think it’ll work.Even though the built-in automation isn’t quite there yet, the hardware is so rock solid and awesome that Yolink gets my highest recommendations.