First let me apologize for replying to your post with an I don’t know. I don’t like when others do that to me but I might provide some insight. For what it’s worth I have ordered several items from Monoprice over the past few years and it’s always been a positive experience. Although I have no personal experience with the USB microscope you referenced I have been using this one from Amazon for a couple of years now that is very similar and about the same price point:
https://www.amazon.com/dp/B00XNYXQHE/ref=wl_it_dp_o_pd_nS_ttl?_encoding=UTF8&colid=13X0BQY3LH588&coliid=I39FMBC3IQUVFB&psc=1
I have bought three different microscopes and this is the least expensive, simplest and it’s still my go-to scope that I use mostly all the time. I keep it plugged in to the USB of a little laptop that I run with the A/C adapter always connected. It’s always on and laying next to my WE. I constantly grab it and hand-hold it flat against the bevel to monitor my progress. With out needing to constantly adjust it I can verify I’m apexing the bevel and see my scratch pattern.
Marc
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