Cartridge alignment channel balance measurements?


I'm curious as to how people go about measuring channel balance when adjusting your cartridge alignment? If you are performing measurements, what is your accuracy tolerances?
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James1969, as Shure once had a record and meter that allowed you to adjust the channel outputs by changing Azimuth, so Denon once had a meter that allowed you to minimize crosstalk. I think I remember that you could also get a Denon product that reduced crosstalk. I have had and sold all of these and rely on my ears.
I have been playing with this PureVinyl software in combination with using the HiFi-News test record. There is a real time Input Balance measurement that gives you a +/- 0.00 measurement. So this would be a differential offset of channel balance.

I would guess that to measure crosstalk, one would have to find a test track for left and a test track for right channels to see the bleed over onto the opposite channel? The idea is to have minimal bleed over into the disabled channel of the test track?
 
Start with the Cardas Frequency Sweep test record for $24 from Acoustics Sounds (or whomever), along with a Voltmeter, then ...

How to measure crosstalk
 
Be sure to read on down that thread on the importance of using a bandpass filter at 1kHz, or you won't get the desired results.