also - a good climbing type helmet - one that has a chin-strap.
note that an actual 'rock climbing' sport helmet is not ANSI rated... although I've gotten away with one for years.
the best ones have an internal suspension system instead of just foam...
- Disto (must have!)
- aircraft cable swaging/crimping equipment
- sheaves - esp. one locking sheave
- several climbing slings for them
- tie line is always good
- scaff hooks for your Y lanyard and central locating ring
- calculator with Trig functions! or even better iPhone or Android Rigging...