fresh to salt weight conversion

[DetectorGuy]

I agree that there are so many variables that could affect the amount of weight, that a weight check when you change configurations is key:
SS backplate weighing 6 pounds versus Alum backplate weighing about half that.
Steel tank versus alum.
Type and age of neoprene in a wetsuit.
Male diver versus female diver.
Individual body type differences.
Type and amount undergarments in a drysuit.
Buoyancy of pony or stage if used.
Buoyancy of extra equipment - canister light or video light batteries.
Even to a slight degree, temp of the water (no pun intended).
current of water.

I always chuckle when I hear the phrase "rule of thumb" since I heard the origin of where that phrase came from. In the old days it was illegal to beat your wife with a stick bigger than your thumb. Let the comments fly, but thats what I heard.