In Indonesia, there are many people suffering the loss of their hands due to accidents or other causes that asking for prosthesis as the artificial hand. They are difficult to get the prosthesis since it is very expensive and a dependent imported product. This research discusses Myo-Electric Signal (MES) device as an initial engineering of prosthesis as Myo-Electric artificial hand product. We propose the processing device by utilizing MES on muscle contraction process using surface electrodes without an external electrical stimulator. The device was developed and is able to seize the MES beneath skin surface ranging from 30-40 mVolt, to filter noise out of the MES , to reinforce input, and to calibrate the MES as a drawing shape. The proposed-device can be used to detect MES, to reinforce 150 times the tension in the range 0 to 5.63 Volt, to spin actuator motor while the muscle is contracted, and to stop spinning when the muscle is relaxed.