Which product design innovation first allowed scientists to continuously monitor ocean temperatures at various depths for months without human intervention?

Product design in scientific equipment has evolved dramatically in recent decades, with innovations that have revolutionized research capabilities. From laboratory instruments to field devices, thoughtful design considerations have made scientific tools more accurate, efficient, and user-friendly. This poll tests your knowledge about a significant product design breakthrough that changed how scientists collect environmental data.

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ARGO floats - autonomous devices that drift with ocean currents while periodically diving to collect temperature profiles
SONAR buoys - fixed surface devices with dangling temperature sensors at predetermined depths
ROV temperature arrays - remotely operated vehicles with attached thermal sensors
Satellite thermal imaging - space-based infrared cameras that measure sea surface temperatures