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高4位进行动态显示。小数点表示是千位，即KHz。-Frequency counter. 4 shows automatically based on the count of seven decimal automatically select 4 of the valid data for dynamic display. Decimal point, said one thousand, that is, KHz,.