The cheapest "analyzer" is the Ilford EM-10. It can usually be bought on eBay for about $10, which won't buy many sheets of paper...

With a little practice, it can be used to: Estimate exposure, adjust aperture to get same exposure at different enlargement, evaluate contrast, select paper to give desired tone curve.

Probably more too, but these are the things I use mine for. It has saved me several hundred sheets of paper so far.