... --100KHz(max 100KHz) Accuracy:0.01Hz. Digital 4/5/6 LED Frequency Meter (FA) Features:1, Input: ... etc,please indicate when ordering.3, 4/5/6 digit display,with demical point switched automatically;Opical isolation ... 4-20mA or 0-10mA with range settable.5, RS232 or RS485 Modbus RTU protocol,connectable ... with various equipment,computer or PLC directly.6, Width Power supply:regular: 80-265V AC/ ...