You can convert PDF files to images that can be read on the eBookWise 1150 (available from Fictionwise), it's small (a bit smaller than A5), cheap (about $120) and back-lit (good for boiler rooms, I would think) but I think the advice about the cheap tablets would be better. Then you can search the PDF files if they are text. Maybe get one that lets you put in more than one battery at a time?
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