... Accuracy: 0.01Hz Analog Pulse Meter/Frequency Meter/Hz Meter(FA) Features:1, Input: various wave form pulse signal (proximity switch,photoelectrical ... instrument has several parameters setting function, easy to operate.2, For other specialize teser for pulse width, duty cycle, etc ... anti-interference.4, Output: up to 3 alarm output with various output modes selectable; high value, low value, ...