Hi again Doppler,
Those scales* are fine for weighing mini amount so no problem on that side of things.
As for the hop pellets being all slightly different, I am no authority on the matter but could imagine that if the shredding was not very fine in the pellet making process that it would not be unheard of to get some discrepancies from pellet to pellet. As a matter of interest...
I just changed an existing recipe to your pot dimensions and have attached the resulting file. (Obviously, you would want to brew beers with less grains than the attached recipe as I'm not sure who would sell you 4 grams of a malt, let alone 121 grams

).
On the hop side, you see that 1 gram of aroma hops is needed. That is probably one large pellet. You almost need to buy a pill cutter as well!
(Doing the above also showed me that your evaporation rate would be massive in that diameter pot. A taller narrower pot would be better.)
...
Now as to your other question about learning something from 1 litre. Well maybe you can. 1 litre is about three bottles of beer so I suppose you would get to taste your beer at three different times.
The real question I think though is that this is a lot of time and work just to make three small bottles of beer. Now if your Mum only drinks a bottle of beer a week, enjoys the process and only wants to brew very simple beer, then this could be fine....
No, it isn't fine. I exaggerated the yeast amount needed in my last post. You actually only need half a gram of dried ale yeast for a 1 litre brew. Everything, ingredient-wise, is just way too impractically small!
I'm amazed enough at your 5 litre batches Doppler

. Small pots are really cheap and I really think that 5 litre batches are already at the extreme.
PP
*Hey! How on earth did I never know you could post IMG files like that?

. I suppose though that if the original link disappears then so does the pic

.
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