I used crescent wrenches back before my highschool shop teacher explained that using one was admitting that you didn't have the right tool for the job over 45 years ago . I learned.
That made the 6" Knipex parallel jawed wrench such a hard sell for me and I resisted it for years but, I have finally seen the light. The Knipex is what I use when my 8" 200 lb bench vise and impact tools are not needed. But they, as with the 3/4" socket set aren't in my take along diving tool kit either. The only tools that I don't own are a 4 jawed chuck for the lathe and a decent milling machine. Drills, taps and dies for use only on stainless are kept in a seperate location from my drills, taps and dies for anything non stainless. And I'm just as anal with the rest of my tools kept in 2 16 drawer body high tool chests and 5x 3 drawer extensions that are stacked on top of each other.
The Knipex, my O-Ring tools, a Shrader valve tool, set of ball headed Allyn Keys, a screwdriver with tips for anything on a reg, including sockets, inner and outer snapring pliars and a pair of needle nose pliars are the only tools that I need to take along for my dive gear.
Sure I've got a different set of tools for my scooters, including the crimping pliars for the wiring, but that only goes along for weeklong cavediving trips.
Michael