Abstract: A multi-meter comprising a switch for selecting an object and a range of a thing to be measured, a display unit for displaying a value measured according to the object and the range selected by the switch, a measurement circuit including a Z-state measurement unit to measure a Z-state of the thing to be measured, in addition to the object to be measured, the Z-state being an unknown state, and a controller for controlling the switch, the display unit and the measurement circuit. The Z-state measurement unit includes a light emitting circuit having first and second light emitting diodes. The first light emitting diode is turned on when the thing to be measured is not at the Z-state and the second light emitting diode is turned on when the thing to be measured is at the Z-state.