Feature: 1. 6-in-1 Meter with Bluetooth Connectivity: Compatible with mobile apps to measure pH, ORP, free chlorine, EC, TDS, and temperature. Suitable for drinking water, hydroponics, laboratories, and aquariums. 2. Cloud Data Management: Enables real-time Bluetooth data transmission with clear, accurate readings. Save, manage, and share measurements easily via the app. 3. Automatic pH Calibration: Features a high-sensitivity glass electrode and five-point calibration (using included calibration solutions: pH 4.00, 6.86, 7.00, 9.18, and 0.01). 4. Comprehensive Display: Immersing the electrode in solution delivers fast, simultaneous multi-parameter readings on the app. Backlight is controlled via the mobile app. 5. High-Precision Water Quality Testing: Equipped with an advanced algorithm chip and optimized electrode for fast, accurate response. Green backlight LCD ensures readability in all lighting conditions. Specifications: pH Range: 0.1–14.0 pH Resolution: 0.1 pH Accuracy: ±0.1 Temperature Range: 0.1°C–80.0°C (31.2°F–176°F) Temperature Resolution: 0.1°C / 0.1°F Temperature Accuracy: ±0.5°C EC Range: 0–1999 µS/cm, 10.01–20.0 mS/cm, 2000–10000 µS/cm EC Resolution: 1 µS/cm, 10 µS/cm, 0.01 mS/cm EC Accuracy: ±2% F.S. TDS Range: 0–999 ppm, 1000–9990 ppm TDS Resolution: 1 ppm, 10 ppm TDS Accuracy: ±2% F.S. Free Chlorine Range: 0.1–4.0 mg/L Free Chlorine Resolution: 0.1 mg/L ORP Range: ±999 mV ORP Resolution: 1 mV ORP Accuracy: ±15 mV Power: 3 × AAA batteries (not included) Display: LCD digital display Backlight: App-controlled Temperature Compensation: Automatic