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.... 
128x128sleepwalker65
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!
For those who are using a mirror make sure you have one that is slivered on the same surface as you rest the stylus, or you will set it wrong.  ( you can get the proper mirror from a camera repair)