The current work describes the development and test of a low-cost biomedical instrument, making use of wearable concepts and discreet components. The instrument aims to monitor, analyze and register the sitting position of an individual, based on the principles of ergonomics. The device allows to verify either the individual finds themselves in a proper position or not, regarding the body posture during sitting position in activities through the use of body sensors. The positioning identification is realized using luminous signaling (LED), which warns the user about their posture. The data collected are stored in a data bank in order to generate graphs for further analysis. The device presents itself as a low-cost solution to help monitoring and study the problems derived from the bad body sitting posture.