Features:Digital pH and ORP controllerDouble 4LED display readingDetachable and replaceable pH and ORP electrodeLarge LCD displayPower Plug for CO2 or Ozone Solenoids or Dosing Pumps are providedWith Relay outputpH and ORP indicatorBuilt-in SLOPE and CAL adjustmentProtection Dead Band featureApplication: Best water monitoring tool in Aquacultures, fish hatcheries, pool, spa, laboratory and in any other water quality control procedure.Specifications:Measuring Range pH: 0.00~14.00pHORP: -1999~1999mVResolution pH: 0.01pHORP: 1mVAccuracy pH: ±0.1% +0.02pHORP: ±5mVSet Range pH: 3.50~10.50pHORP: -500~500mVRelay Contact: 5A for 220VPower Supply: AC 110VEnvironment Condition Temperature: 0~50°CHumidity: <95%Dimension: 150 x 85 x 42mmWeight: 580gmsSet Includes:1 x Digital pH-ORP Controller1 x Detachable pH Electrode1 x Detachable ORP electrode3 x Calibration solutions (pH 4.003 / pH 6.864 / pH 9.182)1 x Mini Screw1 x Holder1 x Power AdaptorEnglish Instruction Manual