Bubble Levels for TT.
I have several, and I bought over a dozen recently to include with an amp stand I designed. They are not as accurate as you expect. I now check them with other levels, return the one(s) that are no good.
My Thorens TD124 had a built in level, I trusted it without ever checking it against another.
Thorens had a built in speed control (a magnetic force/shield, pretty cool if you ever looked inside). You definitely needed to adjust the speed control as it warmed up, every time. I never need to adjust other TT speeds.
I have several, and I bought over a dozen recently to include with an amp stand I designed. They are not as accurate as you expect. I now check them with other levels, return the one(s) that are no good.
My Thorens TD124 had a built in level, I trusted it without ever checking it against another.
Thorens had a built in speed control (a magnetic force/shield, pretty cool if you ever looked inside). You definitely needed to adjust the speed control as it warmed up, every time. I never need to adjust other TT speeds.