BALDR WS0317BL3 Digital Wireless Weather Station | Accurate Humidity Gauge & Temperature Tracking - Monitor 4 Locations - Includes 3 Remote Sensors

Great performing product, the 3 trackers are spread out about 50 to 100 feet a part.

I use this in my RV. One sensor is outside one in my "basement" where the water tanks are located and the other is in the living room. (The main unit is normally in the bedroom.) My only issue is that it will occasionally lose connection to one or all of the sensors. Eventually, it will "find" them and reconnect but it is sometimes a lengthy process.

I put in the batteries (I knew they were not included) and watched the sensors all track each other perfectly for a couple of hours before I deployed them to their final location. Display is easily readable from a distance.

My only suggestion is that the base station also run on an AC power adapter, which would then could permanently turn on the back light.

Might also include adhesive preprinted labels "1", "2", and "3" to stick on the remote sensors so you don't forget which one is set to which channel.

Do check the channel setting switch when you put in the batteries; 2 of my sensors were set to the same channel number so I had to change one of them.

Easy to set up and covers 4 zones.
The switch movement to change the channel is very small. So it is easy to set two units to the same channel. Check that each of the remotes are on a different channel.
I found it took a little time for each of the remote sensors to link to the main unit. I recommend you place all 3 remote units next to the main unit and wait for them to link. Then deploy the remote units to their final location.
Once deployed they are easy to monitor from the main unit.