This 2-in-1 pH & ORP controller and monitor simultaneous measures and displays both pH value and redox value (ORP). It comes with 2 BNC electrodes (pH and redox) and 2 output power sockets. Both electrodes are detachable, they can Be replaced easily at any time. As for the relay output power sockets, you can plug in your own 220V device to it, eg air outlet stone, O3 ozoniser, oxygen pump, CO2-regulator, electromagnetic valve and other ORP & pH. It will turn on your device if the currently measured pH or Redox value is lower than your set value, and it will turn off your device if the measured value Is higher than your set value. Application: Fish hatchery, wine production, swimming pool (bath), laboratories, water conditioning, schools & colleges, floristics, for analysis of fluids (ph-value), ponds, various industrial applications, Pisciculture, Koi, Kois, Boilere, Pond, Pool , Spa, swimming pools, pool, analysis of liquids, orchids breed, breeder, hemp, grow, etc. Specifications: Measuring range PH: 0.00 ~ 14.00pH ORP: -1999 ~ 1999mV Accuracy PH: plusmn0.1%+0.02PH ORP: plusmn5mV Resolution PH: 0.01pH ORP: 1mV Set Range PH: 3.50 ~ 10.50pH ORP: -500 ~ 500mV Relay Contact: 5A for AC 220V Operation Temperature : 0 to 50 degC (32 to 122 degF) Ambient Humidity : 90 or less than 90 % R. H. Power Consumption : 2W Voltage: AC 220V Package List: 1 * PH-ORP Redox Controller