Pulse meter Input: NPN,PNP,encoder,various waves 3 ... Meter/Hz Meter(FA) Features:1, Input: various wave form pulse signal (proximity switch,photoelectrical switch or AC signal, etc ... , easy to operate.2, For other specialize teser for pulse width, duty cycle, etc, please indicate when ordering;3 ... -13217608016(Barbara Guo) 086-13435730867(Peter Liao) Analog Pulse Meter/Frequency Meter/Hz Meter(FA)