Multi-parameter water quality tester with 7 functions: PH, TDS, EC, ORP, S.G, Salinity, and Temperature measurement. Model options: C-600A (with backlight) / C-600. EC Measurement range: 0-10000uS/cm, 10.01-19.99ms, 20.1-400mS/cm; Resolution: 1uS/cm, 0.1mS/cm; Accuracy: 2% of reading. TDS Measurement range: 0-1000ppm, 1000-10000ppm, 10.1-200.0ppt; Resolution: 1ppm, 0.1ppt; Accuracy: 2% of reading. Salinity: 0.00-25.00% range, 0.01% resolution, accuracy 0.1% (0.01-5.00%), 1% (5.10-25.00%). PH: 0.01-14.00pH range, 0.01pH resolution, 0.05pH accuracy. ORP: 0~999mV range. S.G: 1.000~1.222 range. Working environment: 0-60.0°C (32.0-140°F), RH 100%. TDS factor: 0.4-1.0. Temperature: 0.1-60.0°C (32.0-140°F), 0.5°C accuracy, 0.1°C/F resolution. Power source: 3x1.5LR44 (not included). Display size: 33*24mm. Size: 183*37*37mm (7.2*1.5*1.5in). Weight: 105g (3.2oz). Package List: 1*7 in 1 meter, 1*English manual. Color: as shown. Precautions: Clean electrode after each use. If pH calibration fails to identify solution, electrode may be broken.