... or AC signal, etc), contact switch, encoder, etc, used to measure power frequency (AC 0-- 600V), range: 0.01Hz--100KHz (max ... 3 alarm output with various output modes selectable; high value, low value, intervals, etc. analogue output 4-20mA or 0- ... Meter, Coulometer, Voltage Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter, flowmeter,Timer,Timer Relay, Solid State Relay, Proximity Sensor ...