PH-203 Digital 2-in-1 pH ORP mV CO2 Controller Meter 0.00~14.00PH Range

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The Digital ORP/pH Controller is a very reliable and precise measuring instrument wherein the role of an ORP controller and a pH controller are merged. This allows you to monitor and control pH and ORP levels with a single unit. The controller provides a suitable way for you to keep an eye on the different water parameters in your tank. Simply attach solenoid valves or dosing pumps to the plug sockets supplied to dose CO2 or Ozone as required. It has a replaceable ORP and pH electrodes and FREE 2 bottles of calibration solution. The large and informative display of the PH-203 is capable of displaying the status of the current conditions in the aquarium and setting values.

 An ozone generation unit or ozonizers and CO2 system are control devices that regulate the amount of ozone and release carbon dioxide of the water respectively, which largely affects the pH level and filtration of the system. Ozone is an EFFECTIVE AGENT AGAINST PARASITES AND BACTERIAL DISEASES and an excellent water sanitizer, antipollution and disinfectant. A CO2 system helps your fish to RELIEVE STRESS stress and your plants to grow, flourish, and have vibrant colors.

This controller can be use in aquacultures, beverage, fish hatcheries, water ponds, whirlpool, spa, food processing, photography, laboratory, paper industry, swimming pool, plating industry, quality control, water conditioning, and schools. 


  • Accurately, easily and systematically MONITORS and CONTROLS pH and ORP with a single unit
  • It features fast response and easy to calibrate REPLACEABLE pH & ORP Electrodes just so you won't have to buy the whole unit when one of the electrode is not working plus it comes with 2 bottles of calibration fluids for free. A BNC connections for use with a replaceable pH and ORP electrode is also provided for easy connection.
  • APPROVED BY STRICT QUALITY AND SAFETY STANDARDS ensures a reliability, stability, long and trouble-free life and can be transported easily.
  • Power Plug for CO2 or Ozone Solenoids or Dosing Pumps are provided
  • It has an easy to use interface and monitored data continuously thru the large display system in just few seconds.
  • Uses the Protection Dead Band feature, an additional feature of PH-203 in which the controller automatically turned-off or shut down to protect your unit from erroneous readings
  • It includes a comprehensive User's manual, which contains instructions and examples on how to best utilize your pH and ORP Controller.
  • It can handle up to 5 amps and the front LED lamp indicate when relay is "ON".
  • Gives you an option to mount it on the wall or hung on the solution's container while using or installing the unit. 
  • An adaptor for US or UK or Australia or Europe is provided  



  • Measuring Range
            PH: 0.00~14.00PH
            ORP: 0~±1999mV
  • Accuracy
            PH: ±(0.1%+2 digits) after calibration
            ORP: ±5 mV
  • Resolution
            PH: 0.01PH
  • Set Range 
           PH: 3.50~10.50PH
           ORP: 0~1000mV
  • Environment Temperature: 0~50°C Humidity<95%
  • Power Supply: 220V-230V or 100V-110V
  • Dimension: 150mm x 85mm x 40mm


Set Includes

  • 1 x Digital ORP/pH Controller
  • 1 x bottle of 4.003 + 1 bottle 6.864 calibration (buffer) solutions (FREE)
  • 1 x Operation Manual
  • 1 x Mini-screw driver
  • 1 x Controller Holder
  • 1 x Adaptor for Australia or UK or US or Europe (We can provide the different type of adaptor, i.e Australia, UK or US or Europe)
  • 1 x Detachable pH electrode
  • 1 x Detachable ORP electrode  

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