Devices and methods based on disclosed technology include, among others, an electronic device capable of improving a signal transfer characteristic and a method for fabricating the same. The method and kit of the present invention can effectively be used for the sensitive diagnosis of cancers comprising colon cancer, stomach cancer, lung cancer and liver cancer. Further activities include emitting additional acoustic pulses into the drilling fluid using the second acoustic transducer, and detecting them using the second acoustic transducer. The second electrode layer is arranged on a surface of the second light-pervious plate.