... 4)CE,ROHS KH501 is a intelligent tachometer or frequency meter with have high-precision measurement and data acquisition compatible.It ... Pulse input can reach to 30KHz.The meter adpots modern advanced MODBUS communication protocol,with the maximum baud rate up to ... manufacturer, we can supply high quality and performance frquency meter, tachometer,ammeter, , power meter, pannel meter Frequency Meter