Apologies in advance for a really daft question but here goes... I have a STC1000 temperature control system, brew belt and a fridge where I ferment mostly IPAs so tend to set the temperature at 18c. I have used sticky tape to stick a couple of layers of bubble wrap to the FV which makes a chamber that I push the probe into. There’s still a bit of an air gap as the probe isn’t stuck firmly to the Plastic FV. I noticed today during dry hopping that when I hold the probe tight to the FV the temperature was actually 21c not 18c so bubble wrap isn’t an effective way to hold probe. Do you have a tried and tested method of keeping the probe in close contact and insulated against the FV ? Thanks.