Buoyancy HOBO Water Level (100 ft) Data Logger

Dear all, anybody have any idea on how much the HOBO 100ft Loggers weigh in salt water? We are trying to find the ideal buoyancy body to make it stay still under water at about 12m. Technical specifications say 1.9oz in fresh water, however we're deploying in the Baltic Sea and will have varying saltwater conditions. Any help is greatly appreciated Thank you!
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The U20L logger will weigh 1.8oz in average salt water, according to our engineering department. Varying conditions will have some impact, but as you can see the impact is very minimal to begin with.

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