数字频率计 具有4位显示，能自动根据7位十进制计数的结果，自动选择有效数据的

--说 明：高4位进行动态显示。所显示的结果是数码管显示的数据乘以十的N次方；N对应发光二极管的右边点亮的第几位就是几，如果如果最右边的一个被点亮的话，频率就等于显示的

--数值乘以10的一次方。频率的测量范围是0～9,999,999HZ。-Digital frequency meter with four automatically according to the result of seven decimal counting, automatic selection of effective data- Descr iption: four high dynamic display. The results shown is a digital display of the data is multiplied by the N-th power of ten　number N corresponding to the right side of the light emitting diode is lit is, if the rightmost one is lit, the frequency is equal to the display-- The value is multiplied by 10 a square. The frequency of the measuring range is from 0 to 9,999,999 Hz.