USB Digitil microscope advice

@larryi , Yes, you can position it to look at the stylus from the front depending on the turntable. The low power lens (there are three) has to get within 1.5" of the stylus. You could use it for overhang with certain jigs but even the low power lens is really too powerful for that because the depth of field is too shallow. A 10X magnifier is perfect for overhang. I highly recommend the SmarTractor. It comes with a great magnifier and has the best layout and sharpest, easiest to read gradations of any other jig I have used. The Wallyscope is great for VTA and stylus wear. It can be used for physical azimuth alignment which may or may not coincide with electrical azimuth alignment. If it does not I would return the cartridge as defective. Every cartridge I have used priced over $2000 has been perfectly lined up. The Wally Reference with align the cartridge geometrically perfectly with little effort. Then you check things out with the Wallyscope to see if any adjustments need to be made. 

I own a Wallyscope and it is certainly a cut above whatever you are going to find on the net. The problem is positioning and focusing the scope in a horizontal position. With a regular USB scope it will take a lot of cleverness. The Wallyscope stage makes it much easier and it has much higher magnification so you can evaluate stylus wear.

Modern cartridges are very well made. I highly suggest the WallyReference tool. It will line up most cartridges perfectly.