积量频率计

integrating meter digital integrating meter integrating watt meter frequency meter heterodyne frequency meter reaction type frequency meter detector frequency meter counter type frequency meter coupler for frequency meter reed frequency meter transistor frequency meter digital frequency meter light-integrating meter integrating ampere hour meter integrating dose rate meter integrating sound level meter integrating demand meter constant of integrating meter integrating kilowatt-hour meter integrating excess power meter integrating exposure meter direct current integrating meter