Programmable electric timer Industrial used timing/time delay device Count up/down,0. ... life: 100 thousand times it does not depends on the hours. Models: Model and TypeOutputPresetDisplayDisplaySizeHH4-4RNRelay output1 preset 0.01s~9999H4 ... Voltage Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter, flowmeter,Timer,Timer Relay, Solid State Relay, Proximity Sensor, ,Pressure sensor ,load cell ...