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This 2-in-1 pH & ORP controller and monitor simultaneously measures and displays both pH value and redox value (ORP). 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,.The suitable way for you to keep an eye on the different water parameters in your tank! A MUST to have a perfect way to automate 7 regulate the control devices in your aquarium to ELIMINATES FATALITY and MAINTAIN a HEALTHY WATER SYSTEM! Specifications Display: double 4 LED, DUAL display readingConformity: CE and RoHSMeasuring range PH: 0.00 ~ 14.00pH ORP: -1999 ~ 1999mV Accuracy PH: ±0.1%+0.02PH ORP: ±5mV Resolution PH: 0.01pH ORP: 1mV Set Range PH: 3.50 ~ 10.50pH ORP: -500 ~ 500mV Relay Contact: 5A for AC 110V or 220VEnvironmentOperation Temperature : 0 to 50 °C (32 to 122 °F)Ambient Humidity : 90 or less than 90 % R. H.Power Requirement : AC110V ±10% 60Hz / AC220V ±10% 50HzPower Consumption : 2 WattsVoltage: 110V or 220V Set Includes 1 x Dual Aquarium Controller for pH & ORP (110V)*1 x 4.003 + 1 x 6.864 + 1 x 9.182 calibration (buffer) solution1 x Detachable 300cm pH electrode1 x Detachable 300cm ORP electrode2 x Rubber cable holder with suction cap1 x Metal wall hanger1 x Mini-screwdriver1 x English Operation Manual *Please contact us if you need a 220v version