I'm going to suggest the Pocket Ref.
https://en.wikipedia.org/wiki/Pocket_Ref
This has a lot of information across a huge variety of topics.
"...how-to guide containing various tips, tables, maps, formulas, constants and conversions... 864 pages in length... Described as an 'oracle of all things DIY'..." - Wikipedia
It has tables and charts on conversion (weight, distance, area, volume, etc.), formula on a huge variety of disciplines (geometry, electronics, much more), and that's just barely scratching the surface of what's all in this book.
I'm pretty sure it has chemistry and metallurgical information as well.
I'm sure it has translations into the necessary language(s).