The datasheet presents information about measurement, salinity, the platinum cathode, and the oxygen sensor. In the datasheet you can get information such as oxygen, fourier systems, saturation level, and concentration.
There are many info such as sensor, measurement range, respiration, and saturation are described in this datasheet. The following are some excerpt from this datasheet:
It is a galvanic oxygen electrode, capable of measuring % O2 in air and O2 concentration in aqueous solutions in mg/L. The Oxygen sensor can be used to perform a wide variety of experiments to determine changes in % O2 in air and dissolved oxygen levels, especially in aquariums, photosynthesis and respiration of plants and monitoring human respiration. The sensor consists of a galvanic oxygen sensitive electrode with a processing unit (oxygen adaptor, equipped with a calibration knob). The range can be selected directly from the data logger or via the MultiLab software. The Oxygen sensor has to be calibrated before every measurement.
Furthermore, the datasheet tells you information things like oxygen sensor, dissolved oxygen, the measurement range, and calibration.