In this paper the description of instrument called "Quattuor 45" and definition of wave pressure measurements are shown. Special attention is given to measurement of wave pressure created by the wind forcing and wind speed in the investigated area. The study begins with theoretical review and numerous up to date investigations related to the waves approaching the coast. Also, it shows the detailed schematic view of the instrument that is enriched with pictures from ground plan and side view. Horizontal stability of the instrument is achieved by anchorage which relies on two concrete blocks. Vertical wave peak monitoring is ensured by two floats inside the instrument and one float above the instrument. The synthesis of horizontal stability and vertical wave peak monitoring allows to create a representative data base for wave pressure measuring. Namely, the electronic part of the instrument consists of the "Arduino", its memory, four load cells with the appropriate modules and the wind speed sensor. The next part of the research is dedicated to data processing. All results from measurements are stored automatically in the data base and after that detailed processing is carried out in the MS Excel. The results of the wave pressure measurement are expressed by the measuring unit kN/m2. This paper also gives a graphical presentation of the results by multi-line graph. The wave pressure is presented on the left vertical axis, while the wind speed is shown on the right vertical axis. The time of measurement is displayed on the horizontal axis.