Chad here with TimelineSE.com
BillK: That's absolutely true and in fact one of my Pro-Ject turntables runs slightly fast and there's nothing I can do about it but I am willing to accept that and could choose to either modify the drive or if it's that important to get the last percent out of that system i might get another table. Many people including myself choose to make compromises because of other trade-off benefits. If you are absolutely set on a table with no speed adjustment then then there is no reason to measure it's speed if it sounds good to you.

Chad here with timelinese.com: doak, That's a great question. There are a couple of challenges the timeline was designed to overcome. In regards to your question is the nature of the strobe light source and frequency precision of your AC supply. Unless you are using a calibrated strobe you have no way of knowing if it's dead-on. There are systems out there that likely work great but there's more than one way to do it. Second, stylus drag is not able to be a factor when using a strobe disc like the one you mentioned. There's no way to measure and adjust with real world stylus drag. The Timeline SE laser really extrapolates any errors. It would be like having a strobe disc on your turntable 30' in diameter if you aimed the laser on a wall 15' away.

I have had the question additional weight of the record, Timeline or clamp in place but those vertical thrust forces and friction are really nil compared to everything else going on. After all most people wouldn't think twice about checking TT speed when going from a 115 to 200 gram record or 33 1/3 to 45 rpm.

The Timeline SE laser provides a dead-on reference anywhere in the world regardless of your AC frequency reliability.

Thanks for your question and nice table by the way.