I brewed a batch of beer about 3 weeks ago, and I was told to test the gravity prior to bottling to make sure it is ready.
My question is, will I do any harm by opening the fermentation bucket in order to collect a sample to test with. I do understand the principals around proper sanitisation.
I'm more concerned with introducing oxygen into the fermentation bucket if its not ready yet and I have to wait some more. Is that even something to worry about.