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SEALOGGER CTD model SBE 25 uses Sea-Bird's standard modular SBE 3 and SBE 4 sensors to measure electrical conductivity and temperature versus pressure. CTD data (and signals from othersensors, if installed) is recorded in battery-backed CMOS memory at 8, 4, 2, or 1 scan per second (user programmable) giving 1, 2, 4, or 8 hours of memory endurance (CTD only; less with additional sensors).