This pH Controller is an upgraded version. It is the industrial & heavy duty version with a new re-engineered body structure. It allows you to monitor pH as well as controlling pH levels using just one unit. The controller provides a suitable way for you to keep an eye on water parameters in your tank.This controller can be used in aquaculture, beverage, fish hatcheries, water ponds, whirlpool, spa, food processing, photography, laboratory, paper industry, swimming pool, plating industry, quality control, water conditioning, schools, and many other applications. Features: Optional HI/LO action Replaceable pH Electrode Durable and built to last long Big digital display Uses Protection Dead Band feature Gives you an option to mount it on the wall or hung on Specifications: Measuring Range: 0.00~14.00pH Resolution: 0.01PH Accuracy: ±0.1%+2 digits Input Resistance: 1012Ω Set Range: 3.50~10.50pH Voltage: available in 110V & 220V Calibration: Double Points Display 4 LED display reading Power Supply: in Label Environment: Operation Temp. : 0 to 50 °C (32 to 122 °F) Ambient Humidity : 90 or less than 90 % R. H. Power Requirement : AC110V ±10% 60Hz / AC220V ±10% 50Hz Power Consumption: 2 watts Relay Contact : 5A for AC 110V and 220V Output Voltage : the same as power supply voltage Dimensions: 160mm x 102mm x 40mm Weight: 772g Set Includes: 1 x Digital pH Controller pH4.003 + pH6.864 calibration (buffer) solutions 1 x Detachable pH electrode 1 x English Operation Manual 1 x Mini-screw driver 1 x Controller Holder for hanging the device 1 x Power Cord