Disclosed is a mobile communication terminal in which a program code area and an image code area are separated from each other in a code ROM area of a flash ROM, wherein various program routines controlling the mobile communication terminal are stored in the program code area, and images or audio files accessed by the program routines are stored in the image code area. The assembly comprising: first fluid control means and second fluid control means being provided in another opening in said well tubular. Calibration is carried out by moving a reference body of predetermined reflectance and transmittance characteristics into the banknote path between the devices.