most of the indoor/outdoor remote thermometers I've bought, they state in very fine print, not to mount the outdoor sender where they will get soaked with water. Thats things like this: https://www.amazon.com/dp/B07L82PF1Z
Well, that Thermpro model says the sensor is waterproof. We have that very same model here at our house and it does quite well out in the elements plus it has an amazingly strong signal.
yeah, dig into their website, find the specification page, its IPX3, which is resistant to spraying/splashing water thats no more than 60 degrees from vertical... on the outside of a trailer traveling at highway speeds in a rainstorm, sorry, thats just not good enough.
I believe it was @vermilye who mentioned the SensorPush HT1 which I've had for about a year, still on original battery.Which Bluetooth thermometers are people using?