PURPOSE: To efficiently and easily measure and adjust the sensor output voltage of plural sensor in a note identification device.

CONSTITUTION: The sensor output voltage display adjusting system displays the output voltages of the respective sensors 10-17 of the note identification device 1 in turn, and a display adjusting device 2 for adjustment is connected to the note identification device 1 in a way of being attachable/detachable freely. The system is comprised in such a way that the output voltages of the sensors 10-17 are displayed and measured by the display adjusting device 2 by switching the note identification device 1 from a normal operating mode to a measuring adjustment mode, and the output voltages of the sensors can be adjusted within an allowable range according to a measured result.