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I needed to brew today we had a freak weather anomaly 70f but freezing rain tomorrow needed to brew but supplies showed up late so had to pass
It's better than measuring air but you are measuring the coolest spot of the fermentation (the interface between the fermentor and the air in the fridge). Better still, get a bucket of water, put it in the fridge and measure the temperature of the water. It won't be exact but the water will dampen out the temperature swings.
Trub absolutely effects hydro meters. I learned that lesson the hard way...Well she's all done nice golden colour that hydro sample has dropped too to prove that the trub does affect the hydrometer sample full of trub it was 1.048 now after a few hours settling it's reading 1.044 but probably closer to 1.046 accounting for sample temp of 30 degrees. so cheers Jerry P I woulda been cheating