herfdog
I am no rocket surgeon
If your life would depend on being precisely at 65, then yes. But hygrometer are one indication. Do you worry about temp all the same?So it may be beneficial to calibrate at 65 then? Perhaps a bit more accuracy?
A calibrated hygrometer will be within a small percentage of RH, which is what we're looking for. It tells us where we stand. It's not magically bad when the RH is one percent off
I aim for 67, and take zero action when I get anywhere between 64 and 71. If I reach extremes, then I add something to the equation. Since I've been doing that, all my cigars have smoked great. Except one Gurkha warpig, that tasted like crazy, but I have been told by the RH guru to not worry about it.