1. Product Overview
The Walfront PH-803W is a WiFi-enabled 2-in-1 ORP and pH controller designed for continuous water quality monitoring. It measures and displays both pH and Oxidation-Reduction Potential (ORP) values, making it suitable for various applications requiring precise water parameter control.
Key Features:
- 2-in-1 Functionality: Measures and displays pH (0.00-14.00PH) and ORP (-1999~1999mV) simultaneously.
- WiFi Connectivity: Allows remote monitoring and control via a mobile application.
- Real-time Measurement: Provides instant readings for continuous water quality assessment.
- Dual Output Power Sockets: Equipped with BNC socket electrodes and two output power sockets for connecting external devices.
- Durable Construction: Made from high-quality ABS material for longevity.
- Wide Application: Ideal for fish hatching, wine production, swimming pools, laboratories, water quality management, and various industrial uses.

Figure 1: Walfront PH-803W WiFi 2-in-1 ORP pH Controller with its main unit, dual power outlet, and pH/ORP probes.
Video 1: Overview of the PH-803W 2-in-1 ORP Controller Continuous Monitor Meter, demonstrating its features and components.
2. Safety Information
- Do not touch the electrode bulb with bare hands to avoid contamination and damage.
- The glass bulb of the electrode is fragile; handle with care to prevent impact damage.
- Ensure the power supply voltage matches the device's requirements (110V for US Plug model).
- Keep the device and electrodes clean and dry when not in use.
- This product is designed for Android devices only for app connectivity.
3. Setup
3.1 Unpacking and Component Check
Before starting, carefully unpack all components and ensure the following items are present:
- 1 x ORP/PH Water Quality Detector (Main Unit)
- 1 x ORP Probe
- 1 x pH Probe
- 2 x Suction Cups
- 1 x Hook
- 1 x Instruction Manual

Figure 2: All components included in the Walfront PH-803W package.
3.2 Initial Connection
- Plug in the power supply (US Plug 110V) and turn on the device.
- Connect the pH and ORP electrodes to their respective BNC sockets on the main unit.
- Remove the protective caps from the electrodes.
- Clean the electrodes with distilled water or alcohol, then gently wipe the plastic shell and shake off any small water droplets from the electrode tips to ensure accurate readings.
3.3 Mobile App Connection (Android Only)
- Download the compatible mobile application (e.g., Tuya Smart app) from the Google Play Store.
- Create an account or log in to the app.
- Ensure your smartphone's Bluetooth is enabled.
- On the PH-803W controller, long-press the 'WIFI' button to enter WiFi network configuration mode.
- In the app, press 'Add Device'. The app should automatically detect the controller.
- Select the detected device and follow the on-screen prompts to connect it to your WiFi network.
- Once connected, press 'Done' in the app.
Video 2: Step-by-step guide on connecting the device to a smartphone app via WiFi.
4. Operating Instructions
4.1 Taking Measurements
- Insert the electrodes into the solution to be measured, ensuring the measuring electrode is fully immersed.
- Gently shake the electrode to dislodge any small bubbles, which can affect test results.
- Read the stable display number on the device's LCD screen. The device provides real-time measurements without needing to press any buttons to switch between pH and ORP.

Figure 3: Real-time monitoring of water quality parameters on the PH-803W and its connected mobile application.
4.2 Using the Mobile Application
Once connected via WiFi, the mobile app allows for advanced monitoring and control:
- Remote Monitoring: View pH and ORP values, along with temperature, directly on your smartphone from anywhere.
- Settings Adjustment: Change various settings for the controller, such as temperature units. Press the WiFi button on the device to synchronize changes after adjusting settings in the app.
- Data Logging and Export: The app records historical data. You can view data trends over days, months, or hours. To export recorded data, select the desired parameter and press 'Export', then type a file name and save it to your phone.
Video 3: Demonstration of data logging and real-time monitoring features through the mobile application.
5. Maintenance
5.1 After Each Use
- Unplug the power supply.
- Clean the electrodes thoroughly with clean water.
- Replace the protective caps on the electrodes.
5.2 Long-term Storage and Calibration
- For long-term use, regular maintenance and calibration of the instrument and electrodes are essential to ensure accuracy.
- Refer to the specific calibration instructions provided with your calibration solutions.
6. Specifications
| Feature | Specification |
|---|---|
| Model | PH-803W |
| Function | Measures ORP value / PH value of water quality |
| Measuring Range (ORP) | -1999 ~ 1999mV |
| Measuring Range (PH) | 0.00 ~ 14.00PH |
| Accuracy (ORP) | ±5 mV |
| Accuracy (PH) | 0.05PH |
| Resolution (ORP) | 1 mV |
| Resolution (PH) | 0.01PH |
| Setting Control Range (ORP) | -1999 ~ 1999mV |
| Setting Control Range (PH) | 0.00 ~ 19.99PH |
| Operating Environment Temperature | 0-50℃ |
| Display | 4-digit LCD display |
| Material | ABS |
| Power Source | AC power (US Plug 110V) |
| Product Dimensions | 0.39 x 0.39 x 0.39 inches (approximate, based on general product dimensions) |
| Item Weight | 2.83 pounds |

Figure 4: Detailed view of the PH-803W controller, highlighting its dimensions and dual power outlets.
7. Troubleshooting
If you encounter issues with your Walfront PH-803W controller, consider the following:
- Inaccurate Readings: Ensure electrodes are clean and free of bubbles. Recalibrate the device if readings are consistently off. Check electrode integrity for any visible damage.
- No Power: Verify the power adapter is securely plugged into both the device and a working power outlet. Check for any tripped circuit breakers.
- WiFi Connectivity Issues: Ensure your smartphone's Bluetooth is on and the device is in pairing mode (long-press WIFI button). Confirm the WiFi network credentials entered in the app are correct. Ensure the device is within range of your WiFi router.
- App Not Detecting Device: Restart both the device and your smartphone. Re-enable Bluetooth on your phone. Try re-entering WiFi configuration mode on the controller.
- Electrode Life: Electrodes have a limited lifespan and may need replacement over time, especially with frequent use or improper storage.
8. Warranty and Support
For warranty information, technical support, or replacement parts, please contact Walfront customer service through your purchase platform or the official Walfront website. Keep your purchase receipt or order number handy for faster service.





