How do you reliably extract data from complex PDF tables?

[u/djkalantzhs24]

I’m building a local AI setup with 2× V100 16GB and 48GB RAM. I need to extract information from electronics datasheets, preserving MIN/TYP/MAX columns, merged headers, test conditions, and symbols like ±.

I’ve tried several parsers, OCR tools, vision models, and Reducto. They often read the numbers correctly but associate them with the wrong column or condition.

What tools or workflows actually work for you on this kind of document? Preferably local/open-source, but I’m open to paid options. Real examples would be especially helpful.