The inspection of the validity of one coin, label or similar round purpose (M) have the sensor (13) being fixed in the side wall of the guide channel formed within one piece (1). Block is arranged on an angle of vertical line, so that coin is against the wall decline for accommodating sensor. (9) are filled out in base portion when the one angular surface (45) of coin contact for moving into inducer then falls into an energy absorption. Side wall is formed by ridge, so that coin easily wired communication and roller.
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