1.EC: Range: 0-9999us/cm , 10- 400mS/cm 2.TDS: Range: 0-999ppm, 10- 200.0ppt 3.Salinity: Range: 0.01%-25.00% Resolution: 0.01% Accuracy: 0.01-5.00% (±0.1%) 5.1-25.0% (±1%) 4.pH: Range: 0.01-14.00pH Resolution: 0.01pH Accuracy: ±0.05pH 5.S.G: 1.000-1.222 ORP: 0-±990mv TemperatureRange: 0.1℃-60.0℃ /32.0°F-140°F Waterproof Level:IP67 Operation Environment: 0℃-60.0℃ ( 32.0°F-140°F ) ;RH 100% TDS Factor: 0.5 Temperature Accuracy: ±0.5℃ Temperature Resolution:0.1°C/°F Automatic Shut-off: 5 minutes Attention: Clean the electrode after using Color: Black Material: plastic Package Contents: 1 x Water Quality Tester 1 x English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.