... Meter(FA) Features:1, Input: various wave form pulse signal (proximity switch,photoelectrical switch or AC signal, etc ... Opical isolation for input and output,high anti-interference.4, Output: up to 3 alarm output with various output modes selectable; high value, ... Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter, flowmeter,Timer,Timer Relay, Solid State Relay, Proximity Sensor, Pressure ...