A method corrects the error in an output digital signal of an analogdigital converter, in which the error is introduced by a multibit digitalanalog converter incorporated in the ADC. A comparison of the production parts andor iterative improvement specimens is made to a set of input data that includes dimensions and material characteristics. As a result, the effective stirring or transfer of a solution as well as the detection of a biologically relevant substance with high precision can be achieved without causing the aggregation or uneven distribution of magnetic beads or the like. By adopting the authentication system and the authentication method, the device can be paired with a typical mobile phone and used to authenticate the user, thereby enabling mobile payment and mobile banking activities using mobile phones. The beneficial effects are reduction of wood consumption, high production efficiency, low production cost, and small deformation of products such as bending, twisting and warping and thus prolonging the usable period of the products. According to the invention, the second portion of the supporting member of at least one of the cutting members extends over at least half of said predetermined distance.