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The SBE 39 is a self-recording temperature, salinity, and depth sensor developed by Sea-Bird Scientific in the United States, specifically designed for long-term ocean monitoring and profiling. It operates independently with built-in memory and batteries, requiring no external power to record high-resolution water temperature and pressure (depth) data. Some models also offer an optional conductivity module for calculating salinity. The sensor offers high accuracy and fast response, making it suitable for deployment on buoys, anchors, towed systems, or dropped into the water.

The SBE 39 features a robust titanium alloy enclosure, capable of withstanding pressures up to 10,500 meters. It also boasts low power consumption and rapid sampling rates (with intervals as short as 0.5 seconds). It is an essential instrument for deep-sea environmental monitoring, ocean dynamics studies, and climate change research.