brand new and high quality Features: This 2-in-1 WIFI pH & ORP controller and monitor simultaneously 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 for time. As for the relay output power sockets, you can plug in your own 220V device to it, e.g. air outlet stone, O3 ozoniser, oxygen pump, CO2-regulator, electromagnetic v-alve and other ORP & pH control devices. Simply set the desired Hi/ Low pH/redox values in the controller. 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. Applications & Usage: Fish hatchery, wine production, swimming pool (bath), laboratories, water conditioning, schools & colleges, floristics, for analysis of fluids (ph-value), for ponds, various industrial application, Pisciculture, Koi, Kois, Boilere, Pond, Pool, Spa, swimming pools, pool, analysis of liquids, orchids breed, breeder, hemp, grow, etc.The suitable way for you to keep an eye on the different water parameters in your for tank! A MUST to have a perfect way to automate & regulate the control devices in your aquarium to ELIMINATES FATALITY and MAINTAIN a HEALTHY WATER SYSTEM! specification: Model :PH-803W Measuring range :PH: 0.0PH ORP: -1999-1999MV Resolution PH: 0.01PH ORP: 1mv Accuracy PH: (0.1%+0.02PH) ORP: 5mv Setting control range PH: 3.5~10.50PH ORP: -500-500mv or 0-1000mv Use environment: temperature: 0-50, humidity