事实上，这个设备代表了第一个低成本测量音响频率的方法。
In fact, this instrument represented the first low-cost method of measuring audio frequencies.
用于所有电器设备类型操作。例如：音响、电脑、玩具、节能灯、测量仪等。
Operating in all types of electronic equipments such as audio, computer, office toy, light, communications, measuring instruments, etc.
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