测量频率范围：0~5KHZ，测量结果由LED显示；

基本频率上限3KHZ，下限10HZ，超出范围点亮L9报警；

上、下限可通过按键调整。

-measurement frequency range : 0 ~ 5KHZ, the measurement results from the LED display; 3KHZ fundamental frequency cap, minimum 10 9999, outside the scope of lights to install alarm; upper and lower limits can be adjusted via the keypad.