Device for the controlled, representative withdrawal of samples, consisting ofa) a control module (1)with an upper packer (3) and a sensor unit (4) with sensors (5) for the measurement of flow (5.1), temperature (5.2), conductivity (5.3), ph - value (5.4) and the redox potential (5.5) at the measuring point, whereina plurality of flow sensors (5.1) at the probes are arranged and distributed circumferentiallyb) a sampling module (2) witha lower packer (6) and a sample chamber (7) and in this integrated sensors (5) for the measurement of temperature (5.2), conductivity (5.3) and pressure (5.6) as well asa data lugger module (8) for recording the sensor data,c) wherein the control module (1) and the sampling module (2) via a connecting unit (9) are releasably connected with one another.
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