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I bet tri-mix divers like to save all unused gas they can, and it's expensive to discard reserves for common weight checks.
For nitrox and air divers, I don't see a problem - and if you are accustomed to ending dives with 1/3 or more in reserve, therefore negatives - it might be a good idea to plan on more empty tank weight checks.
As a fumbling recreational diver who doesn't get to go much, I do my checks first day of a trip as I commonly end dives with 500# and my pony, but I want to be sure I can get back down and dodge boats even without the pony. I don't have problems, but my home bud who goes less than me often does.
For nitrox and air divers, I don't see a problem - and if you are accustomed to ending dives with 1/3 or more in reserve, therefore negatives - it might be a good idea to plan on more empty tank weight checks.
As a fumbling recreational diver who doesn't get to go much, I do my checks first day of a trip as I commonly end dives with 500# and my pony, but I want to be sure I can get back down and dodge boats even without the pony. I don't have problems, but my home bud who goes less than me often does.