What is the Best Tool to Measure Cartridge Azimuth?

What do you use to measure / set azimuth of your cartridges and / or styli? I am afflicted with diminished eyesight, so aligning the azimuth of the stylus by eye is not practical.

To that end, I’ve use a simple bubble level (spirit level) about 1-1/2” in diameter to get the headshell as close to level as possible, after first leveling the platter by adjusting the turntable feet. 

I figure some clever lever engineer has made an easy to use electronic tool for this purpose, but I haven’t found anything in my searches. Nature abhors a vacuum, so one day if not already, it might surface. 

Until then, does anyone have alternate methods? How about using a test record? Is that feasible? I do have a couple of good oscilloscopes by the way, so I can make precise measurements of levels, phasing, frequency, etc.... 
By the way, I agree that there is no need for a Foz if you have an oscilloscope and know how to use it (which many don’t). You still do need the test LP with 1kHz signal in one channel only. (Needs two bands, one for L channel only and one for R channel only.). Shure made such an LP for the Signet Cartridge Analyzer, for one example. And I agree that in the end it may be best to just adjust the stylus so it sits properly in the groove, regardless of crosstalk, in which case you are relying upon the manufacturer to have built the cartridge to exacting standards, which some do.  99% of the time, I adopt the latter leap of faith.  I think the obsession with azimuth may lead to more alignment errors and more distortion and stylus wear than one would care to admit.
I have a few test records in my collection, so I’ll have to check if any have the single channel 1kHz tones. I couldn’t imagine not having at least one good oscilloscope. For a long time it was a 20mHz Philips 2 channel with CRT, but I have a Tek 100mHz 2 channel with LCD screen also now.  Also have 2 Technics TPBGA003 headshells on order (C$120 each from Panasonic through my Technics / Panasonic dealer) that have the azimuth adjustment feature. The guy there tried to convince me that everything from the cartridge and turntable factories is already optimally aligned, but I want that extra degree of certainty. 
Great minds think alike. I should think a USB microscope would work fabulously well. I use 10X loops because I already have them. You can get a USB microscope for much less!