F
Flintstone
Measuring bars may be accurate if both marks are the same measurement - I tend to always use two marks, and align the cutting wheel, and I prefer to use the tile to get the most accurate measurements, not a ruler/tape measure. So being able to see the marks correctly aligned to the wheel imho is the best practice.
I have done that for a long time with the two marks on the tile but believe me when I say it's faster easier and just as accurate measuring with a tape then cutting the tile on sigma without marking it.