The Xccr Checklist app simplifies rebreather assembly with dedicated checklists mirroring the manual lists. Set precise countdown timers for Positive, Negative, and Pre-breathes. Manage Land Prep, Pre-dive, Post-dive, and Cleaning tasks effortlessly with multiple checklists. Help save the planet by moving away from throw away paper every time you dive to a digital checklist in your phone or Ipad!