Feature: 1. The real-time measurement method is adopted, that is, the dual measurement displays the PH value from 0.00 to 14.00 and the ORP value from ‑1999 to 1999 mV. 2. Easy to use, you can change the measurement value you want to observe without pressing any buttons. 3. The 2‑in‑1 PH and ORP controller can measure and display the PH value and oxidation‑reduction value (ORP), equipped with BNC socket electrodes and two output power sockets. 4. Powered by AC power, it is very suitable for long‑term water quality monitoring and control. 5. The PH controller is made of high‑quality ABS material, which is durable and not easily damaged. Specification: Item Type: PH ORP Controller Material: ABS Model: PH-803W Function: measure ORP value/PH value of water quality Measuring Range: ORP: -1999~1999mV; PH: 0.00~14.00PH Accuracy: ORP: ±5mV; PH: 0.05PH Resolution: ORP: 1mV; PH: 0.01PH Setting Control Range: ORP: -1999~1999mV; PH: 0.00~19.99PH Operating Environment Temperature: 0-50℃, humidity<95℅ Display: 4-digit LCD display Scope of Application: suitable for places that need water quality monitoring, such as fish hatching, wine production, swimming pools (bathrooms), laboratories, water quality management, middle schools and universities, floral analysis fluid (PH value), pond, various industries, etc. How to Use: 2. Connect the PH and ORP electrodes respectively. 3. Remove the protective cover. (Do not touch the electrode bulb with your hands to avoid contamination. The glass bulb is fragile and avoid damage by knocking.) 4. After cleaning the electrode with distilled water or alcohol, wipe off the water on the plastic shell and shake off the small water droplets on the electrode to avoid influence Test results. 5. Insert the electrode into the measured solution, so that the measuring electrode is immersed in the measured solution. 6. Gently shake the electrode to make the small bubbles on the electrode leave the electrode, and read the stable display number when the value is stable. 7. After use, unplug the power supply, clean the electrode with clean water, and put on a protective cover. 8. For long-term use, the instrument and electrodes must be fixed.. Package List: 1 x ORP/PH Water Quality Detector1 x ORP Pole Test Pen1 x PH Pole Test Pen2 x Suction Cup1 x Hook1 x Manual Note: The product can only be used for Android.