to suspend the first conductor 12 and the second conductor 13 in the washing chamber when the electrical washing machine is started up the water quality sensor 1 is turned on at this time the microcontroller 111 of the control unit 11 provides a control signal to the driver circuit 112 causing the driver circuit 112 to drive the first conductor 12 into high and the second conductor 13 into low for a predetermined sensing period and then to output an electric current through the first conductor 12 to the second conductor 13 via the fluid in the washing chamber within the aforesaid predetermined sensing period the microcontroller 111 provides a sensing signal to the driver circuit 112 to detect the conductivity of the fluid between the first conductor 12 and the second conductor 13 the driver circuit 112 of the control unit 11 is adapted for amplifying or filtrating the control signal provided by the microcontroller 111 or to dividing the voltage of the control signal as the driver circuit is of the known art and not within the scope of the spirit of the present invention no further detailed description in this regard will be necessary after the aforesaid.