Zbl-c310a is a specialized apparatus; it is designed according to the electrochemical testing method (natural potential method) of ¡¡ãconstruction testing technical standard¡¡à. By using the electrode polarization theory, c310a tests the potential of concrete surfaces through a cu/cuso4 reference electrode, and determines the level of rebar corrosion with the commonly used natural potential method. Feature: data transfer to usb-thumb drive is available, very convenient for field work; the device generates rebar distribution maps and rebars corrosion potential contour graphs; powerful professional analysis-process software facilitates the generation of test reports automatically.