A feather, especially down, is exquisitely sensitive to air movements. But it is absolutely no use in weather forecasting or anything else.
The exquisite sensitivity seems to me only to help with teasing out the distinction between absolute suppression and not-quite absolute suppression. Not that even that has much importance as far as I can see. Surely it makes more sense to see if FT4 and FT3 are over-range?
I would stick with them. My range for FT3 goes up to 5.7 and my reading was 5.5 and medics happy with my results! My temp is stable at 36.9 which was what I was told to aim for. If you have no hyper symptoms and feel well then carry on.
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