pH ORP Analyzers And Controllers - Global Water 
- Measures and controls pH, ORP and temperature
- 5 programmable relays: 2 for pH, 2 for ORP and 1 for temperature
- Isolated and reversible 4 to 20 mA output for a single parameter
"The Global Water 6309POT multiparameter pH/ORP Controller measures, analyzes, and controls pH, ORP and temperature in one easy to use unit. .........The WQ250 multiparameter pH/ORP controllers provide accurate on/off control via the five programmable relays or the 4 to 20 mA output may be used for proportional control."
From - Global Water Instrumentation
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