... (max 100KHz) Accuracy:0.01Hz. Digital 4/5/6 LED Frequency Meter (FA) Features:1, Input: various wave form pulse signal(proximity switch ... ,duty cycle,etc,please indicate when ordering.3, 4/5/6 digit display,with demical point switched automatically;Opical isolation for ... RTU protocol,connectable with various equipment,computer or PLC directly.6, Width Power supply:regular: 80-265V AC/DC, others: 12 ...