1. Introduzione
The RCYAGO BLE-9908 is a multi-functional smart tester designed for precise measurement of pH, Total Dissolved Solids (TDS), Electrical Conductivity (EC), and Temperature. This device connects via Bluetooth to the YINMIK mobile application, enabling cloud-based data management, real-time monitoring, and customizable settings. It is ideal for various applications including household drinking water, hydroponics, laboratory use, and aquariums.

Figure 1: RCYAGO BLE-9908 Smart Tester in operation, measuring water parameters.
2. Informazioni di sicurezza
- Mantene u dispusitivu fora di a portata di i zitelli.
- Ùn disassemble o mudificà u dispusitivu.
- Évitez d'exposer l'appareil à des températures extrêmes ou à la lumière directe du soleil pendant de longues périodes.
- Ensure the electrode is clean and properly stored to prevent damage.
- Use only specified batteries (3 x 1.5V button batteries).
- Do not immerse the entire device in water; only the electrode part is designed for immersion.
3. Produttu Finituview è cumpunenti
Familiarize yourself with the main components of your BLE-9908 tester.

Figura 2: Exploded view of the BLE-9908 tester, highlighting key components such as battery compartment, display, buttons, and protective cap.
- Pantalla di visualizazione: Large LCD display for readings.
- Bottoni:
- HOLD/TEMP: Data hold and temperature unit conversion.
- MODE/CAL: Function conversion and calibration key.
- ON/OFF: Pulsante di accensione / spegnimentu.
- Compartimentu di batterie: Holds 3 x 1.5V button batteries.
- Cappucciu di prutezzione: Covers the electrode for protection and storage.
- Immersion Line: Indicates the minimum immersion depth for accurate readings.
- High-precision Probe: Contains the sensors for measurement.

Figura 3: Detailed view of the BLE-9908 electrodes, including the Glass pH Sensor, Temperature Sensor, and TDS/EC/Salinity sensor.
4. Setup
4.1 Installazione di batterie
- Unscrew the top cap of the tester to access the battery compartment.
- Insert 3 x 1.5V button batteries, ensuring correct polarity.
- Avvitate bè u tappu.
4.2 YINMIK Mobile App Download and Connection
- Cerca "YINMIK" in your mobile app store (iOS App Store or Google Play Store) and download the application.
- Assicuratevi chì Bluetooth hè attivatu nantu à u vostru dispositivu mobile.
- Turn on the BLE-9908 tester by pressing the ON/OFF buttone.
- Open the YINMIK app. The app will automatically search for and connect to the tester via Bluetooth. A Bluetooth icon on the tester's display will indicate a successful connection.

Figure 4: YINMIK Mobile App interface demonstrating intelligent control, data display, and settings.
5. Operazione
5.1 Basic Measurement Steps
- Eliminate u capu protettivu da l'elettrodu.
- Rinse the electrode with distilled water and gently blot dry with a clean tissue.
- Immerse the electrode into the solution to be tested, ensuring the immersion line is covered.
- Gently stir the solution and wait for the reading to stabilize on the LCD display.
- The display will show pH, TDS/EC, and Temperature readings simultaneously.
- Dopu a misurazione, sciacquate l'elettrodu cù acqua distillata è rimpiazzate u tappu protettivu.
5.2 Funzioni di u buttone
- ON/OFF: Press per accende o spegne u dispusitivu.
- HOLD/TEMP:
- Short press: Hold the current reading on the display. Press again to release.
- Long press: Switch between Celsius (°C) and Fahrenheit (°F) for temperature display.
- MODE/CAL:
- Short press: Cycle through different measurement modes (e.g., pH, TDS, EC).
- Long press: Enter calibration mode (refer to Section 6 for detailed calibration instructions).
5.3 YINMIK App Features
The YINMIK app provides enhanced control and data management capabilities.
- Visualizzazione di dati in tempu reale: View all parameters (pH, TDS, EC, Temp) simultaneously on your phone.
- Sincronizazione di dati: Measured data is synchronized to the app, allowing for convenient viewing and analysis without frequent operation of the meter itself.
- Data Hold and Save: Use the "Hold Reading" and "Save Reading" functions within the app to capture and store data.
- Cloud-Based Data Management: Easily save, manage, and share test data, preventing data loss.
- Paràmetri persunalizabili:
- Controlu di retroilluminazione: Control the backlight of the tester's display via the app.
- Parameter Limits: Set upper and lower limits for pH and EC. If a measurement exceeds these limits, the value will display in red on the app interface, alerting you to abnormal readings.
- Auto-Save Interval: Configure the interval for automatic data saving.

Figure 5: Data synchronization and backlight control via the YINMIK app.

Figure 6: Setting custom maximum and minimum measurement limits within the YINMIK app.
6. Calibrazione
Regular calibration ensures the accuracy of your measurements. The BLE-9908 supports a 5-point pH calibration method and comes with calibration powders for both Asia Standard (pH 4.00, 6.86, 9.18) and EU Standard (pH 7.00, 10.01).
6.1 Calibration pH
- Prepare the calibration buffer solutions (e.g., pH 4.00, pH 6.86, pH 9.18 for Asia Standard). Ensure the buffer solutions are at room temperature.
- Turn on the tester and rinse the electrode with distilled water.
- Press longu u MODE/CAL button to enter calibration mode. The display will show "CAL".
- Immerse the electrode into the first buffer solution (e.g., pH 6.86). The tester will automatically recognize the buffer and begin calibration. Wait for the reading to stabilize and confirm.
- Rince l'elettrodu cù acqua distillata.
- Immerse the electrode into the second buffer solution (e.g., pH 4.00). The tester will again recognize and calibrate.
- Rince l'elettrodu cù acqua distillata.
- Immerse the electrode into the third buffer solution (e.g., pH 9.18).
- Repeat for any additional calibration points as needed. The app can guide you through the 5-point calibration process.
- Once all desired points are calibrated, the tester will automatically exit calibration mode, or you can short press MODE/CAL per esce.
Nota: Always calibrate with fresh buffer solutions. Discard used buffer solutions after calibration.
6.2 EC/TDS Calibration
EC/TDS calibration typically uses a single point standard solution (e.g., 1413 µS/cm).
- Prepare the EC standard solution (e.g., 1413 µS/cm).
- Turn on the tester and rinse the electrode with distilled water.
- Press longu u MODE/CAL buttone per entre in a modalità di calibrazione.
- Pressione corta MODE/CAL to cycle to the EC calibration option.
- Immerse the electrode into the EC standard solution. The tester will automatically recognize the buffer and begin calibration.
- Wait for the reading to stabilize and confirm the calibration.
- Rinse the electrode with distilled water and exit calibration mode.
7. Mantenimentu
7.1 Pulizia di l'elettrodi
- After each use, rinse the electrode thoroughly with distilled or deionized water to remove any residue.
- For stubborn contaminants, soak the electrode in a mild cleaning solution (e.g., electrode cleaning solution or a dilute detergent solution) for 10-15 minutes, then rinse thoroughly.
- Never scrub the glass bulb of the pH electrode, as this can damage it.
7.2 Storage
- Sempre rimpiazzate u tappu protettivu dopu l'usu.
- For optimal performance and longevity of the pH electrode, keep the electrode moist. Add a few drops of KCL storage solution or pH 4.00 buffer solution to the protective cap before replacing it. Never store in distilled water.
- Conservate l'apparecchiu in un locu frescu è asciuttu, luntanu da a luce diretta di u sole è da temperature estreme.
7.3 Sustituzione di batterie
- Quandu l'indicatore di batteria nantu à u display mostra una putenza bassa, rimpiazzate subitu e batterie.
- Vede a Sezione 4.1 per l'istruzzioni d'installazione di a batteria.
8. Risoluzione di prublemi
| Prublemu | Causa Possibile | Soluzione |
|---|---|---|
| Letture imprecise | Electrode is dirty; Calibration is needed; Electrode is dry or damaged. | Clean the electrode (Section 7.1); Perform calibration (Section 6); Rehydrate electrode in storage solution or replace if damaged. |
| Nisun schermu / U dispusitivu ùn s'accende micca | Low or dead batteries; Incorrect battery installation. | Replace batteries (Section 7.3); Check battery polarity. |
| Problemi di cunnessione Bluetooth | Bluetooth not enabled on phone; App not open; Device too far from phone; Interference. | Ensure Bluetooth is on; Open YINMIK app; Move device closer to phone; Restart both device and app. |
| Readings fluctuate excessively | Air bubbles on electrode; Insufficient immersion; Contaminated sample. | Gently tap the electrode to dislodge bubbles; Ensure electrode is immersed past the immersion line; Use a clean sample. |
9. Specificazioni
| Parametru | Valore |
|---|---|
| Numero di mudellu | BLE-9908 |
| Gamma di misurazione | pH: 0.00 - 14.00 pH |
| Risoluzione | pH: 0.01 pH |
| Calibrazione | pH: 5-point automatic calibration (Asia Standard: pH 4.00, 6.86, 9.18; EU Standard: pH 7.00, 10.01) |
| Connettività | Bluetooth (YINMIK Mobile App) |
| Alimentazione elettrica | 3 x 1.5V Button Batteries (Included) |
| Stile di visualizazione | Digital LCD with backlight control via App |
| Materiale | Vetru (elettrodu) |
| Dimensioni | 23.6 x 8.2 x 5.21 cm (Pacchettu) |
| Pesu | 168 g (Pacchettu) |
10. Garanzia è Support
For warranty information and technical support, please refer to the product packaging or contact RCYAGO customer service directly. Contact details are typically available on the manufacturer's official websitu o per mezu di u vostru puntu di compra.
Per piacè visitate u pagina ufficiale di u produttu for the latest information and support resources.





