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@Stonehedge
It's a bit if a rabbit hole finding good ones tbh.
There used to be a product called a thermopeanut which was perfect for what you want. Six month battery life, loggin, ble sync but they went out of business and bricked all of their sensors when they shut the servers down.
The best on the market is Sensorpush, but they are £80 each.
I'm hoping that the iot4 ones work well. If they don't, I'm just going to make my own using an esp module and thermocouple.