Difference between a meter and controller, eg PH

dallasg

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hi,

would like to know the above? and how they would work
 
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the one mesures something the other would have an output to control something.... IE a CO2 feed into a CaRX
 

dallasg

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cool, thanks
ORP controller would control ozone etc
 

dallasg

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thanks guys
 
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Put simply, a meter can just measure a parameter, and do nothing else...

a controller is a meter which can also switch something on or off...
 

dallasg

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thanks hennie
 

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