Quoted from Ed_in_Texas:Barring personal preference, on a WPC95 game (MM, SS, MB, etc), what is the factory recommended setting level? Where should the bubble be?
The first line is at 6 degrees, and each line after that is another .5 degrees. The second line is thicker than the others, because it indicates the recommended 6.5 degree pitch. In your photo, the bubble is right around the 7.5 degree mark.
Here's an excerpt from the TZ manual: