Usage Tips: This device measures pH, TDS, EC, ORP, specific gravity (S.G.), seawater specific gravity, and temperature. It supports a wide measurement range suitable for freshwater, seawater, and aquarium applications. The device features IP67-rated waterproof and dustproof protection, enabling resistance to dust ingress and short-term immersion. It is portable and ideal for measuring water quality in various settings, including tap water, reverse osmosis (RO) systems, aquariums, seawater, and swimming pools. An automatic power-off function activates after 5 minutes of inactivity to conserve battery life. The display uses a clear LCD screen showing 4-digit values with corresponding units. Specifications: Model: C-600A (with backlight) / C-600 (optional) EC Measurement Range: 0–10,000 µS/cm; 10.01–19.99 mS/cm; 20.1–400 mS/cm EC Resolution: 1 µS/cm; 0.1 mS/cm EC Accuracy: ±2% of reading TDS Measurement Range: 0–1,000 ppm; 1,000–10,000 ppm; 10.1–200.0 ppt TDS Resolution: 1 ppm; 0.1 ppt TDS Accuracy: ±2% of reading Salinity Measurement Range: 0.00–25.00% Salinity Resolution: 0.01% Salinity Accuracy: ±0.1% (0.01–5.00%); ±1% (5.10–25.00%) pH Measurement Range: 0.01–14.00 pH pH Resolution: 0.01 pH pH Accuracy: ±0.05 pH ORP Measurement Range: 0 to ±999 mV S.G. Measurement Range: 1.000–1.222 Operating Environment: 0–60.0°C (32.0–140.0°F); up to 100% RH TDS Factor: 0.4–1.0 Temperature Range: 0.1–60.0°C (32.0–140.0°F) Temperature Accuracy: ±0.5°C Temperature Resolution: 0.1°C / 0.1°F Power Source: 3 × 1.5V LR44 batteries (not included) Display Size: 33 × 24 mm Dimensions: 183 × 37 × 37 mm (7.2 × 1.5 × 1.5 in) Weight: 105 g (3.2 oz) Package Includes: 1 × 7-in-1 meter 1 × English user manual Note: - This item is shipped without retail packaging. - Always clean the electrode after each use. - If pH calibration fails to recognize the calibration solution, the electrode may be damaged.