四位十进制数字频率计：

测量范围：1Hz～10kHz；

显示时间不少于1S；

具有记忆显示的功能，即在测量过程中 刷新数据，等结束后才显示测量结果，给出待测信号的频率值，并保存到下一次测量结束。-Four decimal digital frequency meter:　 measuring range: 1Hz ~ 10kHz　

show that no less than 1S

with memory function showed that the course set in the measurement data, and so on until the end of the measurement results show that, given the frequency of test signal value, and save it to the end of the next measurement.