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Well, I purchased that Tomlov and here's a chisel edge pic.  Thoughts?

Thanks for the info and I'll do that search. I've seen pics that look close, but without great resolution and some that look molecular (exaggeration).

I've sharpened knives to 12 and 15 dps.  Would that be the same as sharpening a chisel to 25 to 30 degrees?

but don't want to spend more than $500.  I was looking at this one, as it gets in pretty close and has good resolution.  Is there one that gets closer with greater resolution and and gets even closer?
https://www.amazon.com/dp/B0B7NKGH1C?ref=ppx_yo2ov_dt_b_product_details&th=1

Well, I am able to get my readings down to around 100, so I guess I'll be satisfied with that for now, although I see no reason why I shouldn't be able to get them down closer to 50.

Here's a tighter shot...

I just tested these chisels and got around 120 BESS.  Is there anything you can tell me about the edges from these pics?

Good video and thanks Ken, for your input.  100 BESS gives me something to shoot for.  My initial thought was that I should be getting the same BESS readings for chisels that I get with knives, which is between 50 and 100, but that hasn't been the case, so I was wondering why.  My journey continues, I guess.

I recently watched a sharpening video from Jonathon Katz-Moses here https://youtu.be/GBjiEmN5HzA and he was getting results in the 110-120 range after stropping. For 25 - 30 deg bevels this seems to be about right.

Thanks John. I'll for sure watch it. I'm used to getting below 100 with knives, so I wonder why the difference?

I don't see why you couldn't use the USB as a rest for stone grading, provided the plate is stiff.  But I think 160 grit is way too course for the SJ stone.

Yes it may be, however I wanted to try it since I use that same diamond plate to flatten all of my other water stones and ceramic stones. 

So after you've gone through the grinding wheels, what's the best way to finish chisels?  Should one follow the same procedure as one would on a knife's edge?  What do you personally do?

I've been working on chisels and would like to have some comparison BESS readings to shoot for.  Theoretically, I would think they should be like knife readings, but I'm not sure that relates to real world. 

I've got a thick, heavy, 160g flattening diamond plate.  Can I simply rest that against the USB to grade the surface of the SJ?  Seems like that is doing the same thing as the SE-77, just eliminating the middle man.

Interesting, could you give the reading taken with a tape measure in between two stripes on the wheel ?
A 50hz phenomenon with a 248mm (trued) wheel would give 1.5 cm.
I don't have the inner diameter of the drive wheel in mind, but it could also be something that happens with every revolution of the drive shaft, it can be easily computed.
I wouldn't rule out that it has something to to with your grading. First off, 400g seems quite coarse to me, that's something I would use for grading my SG, not my SG. Vadim used to recommend 1000g for the SJ. That being said, it's like the stone has been smoothed out by something wobbly...

Best I can do is, it's about 8mm peak to peak on average on the second photo.  Also, on that photo, I did try 1k diamond. I did send a note with photos to Tormek Support.  One thing...after using the TT-50, the surface was higher on the inner surface than the outer.  I noticed that when I mounted the 400g diamond in the SE-77 to smooth the surface.

Hmmm...just guessing, but that looks like a constant oscillation pattern that might be related to  manufacturing?  Did you notice any oscillation while truing with the TT-50? It would be interesting to run a dial indicator over that stone while rotating it by hand on the motor shaft. I would send those photos to TORMEK product support to hear if they have a good explanation.

I did notice some vibration, but not enough to be of concern at the time.  Using the TT-50, I didn't notice any vibration other than that created by grinding.  I think I will email support on this.