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The Direct Conductivity/Resistivity (Cond/Res) Module interfaces Signet 2819-2823 and 2839-2842 Conductivity electrodes directly to the 9900. (Conductivity/Resistivity and Salinity measurements may also be performed via the 2850 Sensor Electronics connected through the 9900 Digital (S3L) inputs.) The Direct Conductivity/Resistivity Module interfaces Signet 2819-2823 and 2839-2842 Conductivity electrodes directly to the 9900. The moduel also provides filtering and conditioning. (Conductivity/Resisitivity and Salinity measurements may also be performed via the 2850 Sensor Electronics connected through the 9900 Digital (S3L) intputs.)