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As part of the optimisation of the follow-up of dredging works, the Department of Mobility and Public Works, Maritime Access division, has purchased a number of density-related measuring instruments. These instruments represent the various measuring principles available on the market for the measurement of in-situ density of (dredged) mud: “With which density instrument (or combination of instruments), with which accuracy and with which repeatability can we measure the dredging mud in a practical way?”. In addition to density, measuring devices were also purchased to chart the strength of the mud. A number of campaigns were carried out in Zeebrugge to test the feasibility of deploying a number of instruments. This feasibility consists of: user-friendliness (manipulability: safety, lateral and temporal application, data acquisition, data processing,...) and the accuracy, the resolution and the repeatability of the measurements. During the first two campaigns, the focus was on mobilisation (connecting the periphery, adjusting the setup), demobilisation, manipulability, safety and the possibility of combining the various instruments. The integration of external parameters, data acquisition and data flow were also tested and fine-tuned. A third measurement campaign focused on the repeatability, resolution and accuracy of the recorded data for density. For accuracy, a sampling that represents the ground truth is required. However, due to failure of the sampling equipment, this could not be done in-situ. As an alternative, a validation measurement was organised at Flanders Hydraulics Research where mud with known densities was measured. The results of these measurements and a theoretical description of the measuring instruments considered are discussed in the following report.