Is there any reason not to simply lower a hydrometer into my carboy during secondary fermentation, so that I can monitor gravity just by peeking in with a flashlight?
I'm thinking about doing this with a recent tripel batch, so I don't have to disturb it multiple times by taking readings. I'll take precautions like sterilizing the hydrometer. I also think I will tie something like dental floss (sterilized) to it so that I can gently lower it in, drape the loose end over the lip wedged between the lip and the bung, and remove it safely later.
It'll sit there like an iceberg poking its head out, and I can act early if I start to feel like fermentation has stuck. Keep in mind this a beer I would like to leave in the secondary for 3-6 months.
This seems like a good idea to me, but I have lots of "good" ideas that turn out bad. Is there any reason you would not do something like this (either from experience or imagination)?