Do you use variable speed on your turntable?

Here's a perfect example of HYPE and GOUGE, praying on those of us, concerned with TT speed accuracy: (http://www.musicdirect.com/p-4838-digistrobo-turntable-strobe.aspx) This is NOT a, "strobe" at all, but- a simple LASER tachometer, that has been rebranded. They act as though it were something new. LASER tachs have been around for DECADES. Tell me the difference between it and any of these(outside of PRICE and appearance): (http://www.amazon.com/Digital-Photo-Laser-Tachometer-Contact/dp/B000EUT9ZS) (http://www.ebay.com/itm/LCD-Digital-Laser-Photo-Tachometer-Non-Contact-Counter-/110703270848?pt=AU_Car_Parts_Accessories&hash=item19c66ddbc0) (http://www.grainger.com/Grainger/Tachometer-5URH0?Pid=search) I own the last one, as it resolves out to hundred thousands, and is a tad bit more accurate(+/- .04%). The ONLY thing you DON'T get with these, is the small disc, with the reflective strip already on it. HARDLY worth $100.00, for something I can make for free(and completely non-essential). The reflective strip, on my record clamp, works just fine(as would a strip on the platter edge). The great thing about this method, is one can measure speed, with the record playing.

Something that got me thinking more about speed accuracy lately, as both of my tables are equipped with AC synchronous motors: (http://wattsupwiththat.com/2011/06/25/it-hertz-when-you-do-that-power-grid-to-stop-regulating-60-hz-frequency/) (http://radiomagonline.com/infrastructure/power/60hz-stability-going-away-0627/) If you are using a strobe disc, that depends on your house lighting's 60Hz flicker, or your table has a motor, dependent on your AC's 60Hz for speed regulation; take note. This may soon become a concern.

If all their planning on doing is eliminating the error correction every night, I don't think anyone will notice except those who still use synchronous clocks. If this is the case, we have that error every day now.

Pardon the grammar.

Ummm... Boys.... How is one to tune one's turntable to A440 or some variant thereof without an LP that bears a recorded A440 tone? A tone generator is only half of what one needs. I know of no test LP that has such a band on it, but possibly one exists. And even if one has both the necessary pieces of equipment, one is still dependent on a good sense of pitch. It might be better to run the tonearm cable directly into a calibrated oscilloscope, assuming you have the needed test LP. That would eliminate subjective judgement of pitch. (I ain't doin' any of this; I'm just sayin')

The beauty of the KAB strobe is that it runs on batteries and so gives a constant frequency regardless of what's coming out of your wall socket. It's very accurate, and I doubt a laser record weight is much better, just more spectacular and easier to monitor from your listening chair.