Thanks everyone for their help.
It sounds like the only way is to do a hydrometer reading a few days in a row.
1. Don't I run the risk of contaminating the beer?
2. Do I just need to make sure everything is completely sanitized before doing the hydrometer reading
3. Taking the top off the primary multiple times doesn't ruin your beer?
Sorry for the questions but I'm just a rook!
You can just leave it in the primary for 4-6 weeks and be pretty sure it's done...
But yes, if you want to KNOW it's done, take a SG reading.
Yes, every time you gain access to the sealed container there is risk of infection, and oxidation.. but with just a bit of work it's mitigated risk.
Using buckets,,, do you have the small 3/8 sized hole, grommet for your air lock?
Or the larger hole and stopper for the air lock?
If the larger hole, a
Plastic Thief (Fermtech)slides right in that hole.. otherwise yes, the lid has to come off ( waste of time and energy for me,,, drill a larger hole in the bucket , use a larger stopper for the air lock)
Many keep a spray bottle of starsan next to your brewing stuff... get in the habit of spraying anything that will come into contact with the beer, or the bucket, or anything that touches anything...lol
For your readings, if you have to remove the lid, spray the lid latching area well, the tool if used to remove, and your hydrometer ...wait the 90 sec suggested.. then pry off the lid, lay it on a sanitized countertop, or clean town soaked in starsan..., and take your reading. , spray the lid, and snap it back in place.
If you have a large hole in the bucket a thief will fit... spray the stopper and air lock and the thief, remove stopper, dip in thief, remove, spray bucket hole and air lock stopper and reinstall.
Then take your reading.. no need to really stress sanitizing the hydrometer.. as you never return the sample,, so even if contaminated.. no worrys.
You can see the thief though a bucket hole is a lot easier..
Last note... SOME hydrometers are a little too large in diameter for a commonly available beer thief.. they are a tight fit in the tube and will not float freely.
I found this out the hard way last week.. having broken my previous hydrometer that did fit in the thief.. I was surprised when my new one would not read correctly (free float). The larger diameter was just too big for the thief tube.. a
Plastic Hydrometer Test Cylinder
fixed that right up.