Portable hand held potentiostat-galvanostat is an instrument widely used in laboratory or in field use. It is ideally suited for the in field development of electrochemical sensor technologies, and as a very cost effective electrochemical and portable corrosion analyzer. It can be connected to a PC in the laboratory for complex electrochemical and corrosion experiments such as very fast linear and cyclic voltammetry, chronoamperometry, square wave voltammetry, normal and differential pulse voltammetry with unsurpassed ultra low noise performance.