When reading a buret, where is the initial and final volumes taken from? The top (where the zero is) or the bottom?. If the buret is completely full, is my initial volume 0?

When reading a buret, the initial reading should be taken from the top of the glassware and the final volume should still taken at the top. If the buret is completely, the initial volume for most buret would be zero. though, there are some where their initial starts at 50 decreasing to zero.