It's going to be about 11% abv still apple wine fermented with spices.
How much metabisulfate should I add at the time of bottling to keep
it fresh at room temperature for a while?
Thank you.
How different readings could be if the 'bulb' is not cleaned well but calibrated? Is it +/- 0.1 pH or could it be really dramatic for simple home winemaker?
I would wait until Malolactic Fermentation if it didn't happen yet.
Plus you can reduce tartaric acid by cold stabilization.
And you can balance acidity by sweetness. 0.8 tA isn't too much.