... Meter/Hz Meter(FA) Features:1, Input: various wave form pulse signal (proximity switch,photoelectrical switch or AC signal, etc), contact ... function, easy to operate.2, For other specialize teser for pulse width, duty cycle, etc, please indicate when ordering;3, 4/5 ... protocol, connectable with various equipment, computer or PLC directly.6, Width Power supply: regular: 90-260V AC/DC, others: 12--30V ...