I used to use a level and go side to side, front to back, and corner to corner. Now I use a circular bubble level. It is easier and I believe it has better accuracy because it shows 360 degrees.
Leveling your turntable, your approach?
Not satisfied still with the sound from my TT setup, I decided to revisit the leveling situation. I discovered it was fine side to side, it was slightly low in the back, by 1mm or so. However, I thought why not tackle the levelness as it effects the arc of the cartridge with an actual record on the platter. A whole new issue was presented as my 5" Empire spirit level spanned from label to rim of several records to dial in a new dead level as the stylus would ride. Have I reinvented the wheel on leveling, or is this a novel approach, Cheers, BR