Computer depth accuracy at shallow depths?

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...after viewing your avatar, it certainly does appear YOU really COULD use a dive computer that senses dangerous marine life....... :)

I'd be happy with one that tells me how much salt is in the water, if for no other reason than to impress divers who might be unfortunate enough to be stuck with me for a 2 hour boat ride out to some wreck.
 
Cochran Undersea Technology

SEA WATER/FRESH WATER RECOGNITION (High/Low Conductivity): There is approximately three-percent difference in depth readings taken in fresh water versus
seawater. Some dive computers are calibrated in feet of fresh water and some are calibrated in feet of salt water. Diving in a medium different from what the dive computer is calibrated will cause apparent depth errors. Only COCHRAN dive computers, including the GEMINI, actually determine the type of diving medium and compensate the depth reading accordingly. This is accomplished by measuring the conductivity of the water during a dive. Caution must be taken in interpreting this reading since some apparent fresh water is actually high in minerals or contaminants and is correctly compensated as salt water (High Conductivity). This commonly occurs in some caves, springs and lakes.

Dead sea, great salt lake..etc, etc. Important feature if you don't know where you are, and like you dive log to be accurate. Other than that, am missing why that would be of any value (as it does not change the deco information, just the relative depth.

Which is an interesting point... if the objective was to show the right depth, why would it matter where you were, as high conductivity = heavier water. It could just use the value and show the calculated depth....odd.
 
...a 'real' dive computer can tell the difference between fresh vs salt water and auto-adjust for that.

Before I give advice or information I like to have as much data as possible. You should try it. Most diving is done in salt water for your information.
 
https://www.shearwater.com/products/perdix-ai/

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