Voted none... just a simple acronym prior to diving: FLAGS
Flow - (unrestricted and proper one way valve behaviour)
Loop - (integrity +/-)
Analysis - (Did I use the proper gasses? (Checked by flushes))
Gauges - Do I have enough gas (includes bailout) and while I'm at it brathing from that.
Scrubber - Warm up and (a tad late) how much time is left on it
Post dive its just turning of the meters. If you've gone though the battery change hassle you'll be focussed on that even without checklist.
How I love my Kiss for this simplicity
