My personal favourite that I've given as a gift is Thomas Glover's Pocket Ref [0]. Its easily the most useful thing you can buy for anyone in engineering, fabri

My personal favourite that I've given as a gift is Thomas Glover's Pocket Ref [0]. Its easily the most useful thing you can buy for anyone in engineering, fabrication or just generally a tinkerer. I've loved my copy since I was given it as a kid. [0] - https://www.amazon.com/Pocket-Ref-4th-Thomas-Glover/dp/1885071620 https://www.amazon.com/Pocket-Ref-4th-Thomas-Glover/dp/18850...