This 2-in-1 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 time. As for the relay output power sockets, you can plug in your own device to it, e.g. air outlet stone, O3 ozoniser, oxygen pump, CO2-regulator, electromagnetic valve and other ORP & pH . 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), ponds, various industrial application, Pisciculture, , Kois, Boilere, Pond, Pool, Spa, swimming pools, pool, analysis of liquids, orchids breed, breeder, , grow, etc. The suitable way to keep an eye on the different water parameters in your tank A MUST to have a perfect way to automate & regulate the in your aquarium to ELIMINATES FATALITY and MAINTAIN a HEALTHY WATER SYSTEM Display: double 4 LED, DUAL display reading 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 Environment: Operation Temperature : 0 to 50 degC (32 to 122 degF) Ambient Humidity : 90 or less than 90 % R. H. Power Requirement : AC220V plusmn10% 50Hz Power Consumption : 2 Plug Type :EU Plug,it applies to Indonesia, Germany, France, , Italy and so on. Colour:blue Material:plastic Package Contents: 1 x Dual Aquarium Controller for pH & ORP 1 x pH electrode 1 x ORP electrode 2 x Rubber cable holder with suction cap 1 x Metal wall hanger 1 x Mini-screwdriver 1 x English Operation Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.