Abstract: A smartphone-connectable multimeter having an automatic measurement target detection function, a measurement system including the same, and a measurement method using the same is provided. The smartphone-connectable multimeter includes: a housing; a pair of lead wires equipped with probes, and drawn from the housing; a range module configured to rectify and transform an electric signal, and installed in the housing; a voltage module configured to generate electricity and apply current to the measurement target; and a process module configured to receive instruction data, to generate analysis data by converting the electric signal, processed by the range module, into a corresponding digital signal suitable for an electrical characteristic according to settings of the instruction data and analyzing the digital signal, and to perform control so that the voltage module applies current when an electric signal is not received from the measurement target, and installed in the housing.