A measuring rod for an electric meter and an electric meter assembly using the same are disclosed, wherein the device to be detected disposed around the front end of at least one of the test probes allows the electric meter to determine the type of currently inserted test probes and whether the test probes are suitable for use under a current operation mode of the electric meter in a situation when the device to be detected is inserted into the electric meter; and the measuring socket corresponding to the device to be detected is disposed with a determination mechanism for allowing the electric meter to determine whether the abovementioned test probes or test probes of different types are suitable for use under a current operation mode of the electric meter.