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jellybaby
Hearsay rather than experience, but a few YouTube machinists I follow proselytise about cheap Chinesium digital camera microscopes for inspection on the same scale as you're working with.
Not necessarily this exact one, but this pattern and price range
https://www.amazon.co.uk/TOMLOV-Microscope-Magnification-Ultra-Precise-Compatible/dp/B08G4Y6C65/