A large arbor anti-reverse fly fishing reel provides by its handle a convenient variable drug control up to a present drag force. The liquid component is separated from the solid-liquid mixture by means of the rollers and the solid component is discharged from the discharge window on which pressure has been exerted by means of the pressure application lid. A multiplyingdividing circuit multiplies the first voltage by the second voltage, and divides the resulting product by the third voltage, so as to generate a fourth voltage.