I would love to have a read of the 2nd edition book but not for the price it is currently retailing at. Having flicked through the 1st edition I can assume it's a guide to setting up a lab and getting your head around some of the basics but from a Fluke PoV where you will be working with Fluke equipment.
I agree that it's not worth the current prices of well over $100 (I'm sure I paid much less). I haven't compared them side by side, but according to Fluke the second edition has over 400 pages (they use per-chapter numbering, so I can't easily verify), while the first was one fourth of that. So the second goes into quite a more detail. It describes at a somewhat elementary level the standards and transfers of electrical quantities, including a bit of history. Unlike the first edition it describes JVS/QHE as primary standards. It will also give a very schematic description of how their current products in the early nineties like 732B, 752A, 720A, 5700A etc worked. And it gives some general description on a range of topics including cabling, guarding, parasitics, statistics and uncertainties. None of it is super in-depth, for example the GUM documents by BIPM go into much more depth then the uncertainty chapter in the Fluke book, but in my opinion its breadth makes it useful.