frequency meter [电子] 频率计 ; 频率表 ; 测频计

flow meter frequency 流量表频率

digital frequency meter 数字频率表 ; [电子] 数字式频率计

vibration frequency meter [仪] 振动频率计

heterodyne frequency meter 外差频率计 ; [电子] 外差式频率计

absorption frequency meter 吸收式频率计

vibrating reed frequency meter 振簧式频率计

buzzer frequency meter 蜂鸣器频率计

beat frequency meter 差频频率计

resonance frequency meter 谐振式频率计