The penetration of high and low power electronics and distributed generation in electric power systems resulted in poor power quality and lead to increased failure rates in high voltage equipment. Additionally, the quality of power measurements was decreased as the metering devices cannot accurately operate in poor quality networks with higher order harmonics. The poor power quality was identified in the area of supraharmonics, caused mainly from switching power supplies and inverters. For these reasons it is of paramount importance for the electric companies to have accurate knowledge of the quality of electric power offered. Nowadays, the majority of market available measuring devices can detect up to the 64^th order harmonic. However, the confirmed existence of harmonics in the range of up to 150kHz, known as supraharmonics, in the power system makes their identification an urgent need. Even though some market available solutions for supraharmonics exist, their cost is very high, and their implement ability presents limitations, especially in the case of multiple online measuring positions in a grid. This work presents a prototype system developed in the High Voltage and Power systems Lab of the University of West Attica, which measures supraharmonics in the electricity grid, aiming to decrease measuring cost, installation limitations, providing at the same time network connectivity and has IoT capabilities. It is developed using a Field Programmable Gate Array (FPGA) based device including an online platform for the interpretation of the results.