Is there a CYA test that is more accurate than filling the tube until you can no longer see the black dot?
If yes, what is it?
If no, I need clearer instructions. If you see a vague dark shadow in the bottom of the tube does that count as seeing or not seeing the black dot?
If yes, what is it?
If no, I need clearer instructions. If you see a vague dark shadow in the bottom of the tube does that count as seeing or not seeing the black dot?