Yes.? A “depth micrometer” is a different measuring tool.? A “depth micrometer” would be the mechanical style micrometer scheme with the rotating barrel.? The Bangood device is, however, a real “digital depth gauge” (in the same sense as a “digital caliper”).? It is just a pretty cheap one and being marketed with a tip on it suitable for checking tires.? But it would be completely usable for machining within its limits.
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It does seem to have a plastic base (cheap) instead of a machined and ground metal base.? It seems to have the identical head on it that I have on a cheap 4” Chinese digital caliper (very handy size sometimes – but it became unreliable so I recently bought a Mitutoyo 4 inch).
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If I didn’t already have a depth micrometer and wanted something inexpensive, I would probably try one of these.? It is easy to check them.? You can make a setup with gage blocks but most won’t have those.? So instead you set a flat piece you have measured on another flat piece and measure the step.? Not ideal, but probably fine in the world of mini-lathes.? In the case it might read slightly off, it should read slightly off at all positions as an offset error.? You would just have to remember that offset.
