@UKSkydiver Not thick or naive, you correctly say iSpindels are affected by all sorts of things and therefore your data is affected. Having said that and as you say it gives and idea of what is going on inside your fermenter. So if you run your fermentation at one temperature through the whole cycle then you can just use it to say when the fermentation is going and when it's stopped, but not rely on it to tell you the actual SG.
However, if you vary the temperature during your fermentaion you cannot rely on the raw numbers coming from your device. Having the device make adjustments for temperature I think IS an improvement. I personally don't rely on the actual numbers from my iSpindels but I would just like to see a graph (from Fermentrack) that wasn't skewed by changing environment.
I now have my iSpindels well calibrated at high and low SG but less so in the middle as that's where there is quite a lot of variation in "performance" due to the crud and bubbles. As an example at the begining of my current brew, a +4C change gave a +5 point change in SG before adding yeast. So I can remember that difference and apply it next time, but at my age I'll probably subtract rather than add
and I'll then panic thinking my fermentation has stopped.
