Specification: Condition: 100% Brand New Item Type: Water Quality Tester Material: Plastic EC Test Range: 0 to10000uS/cm 10.01-19.99ms 20.1-400mS/CM Resolution: 1uS/cm; 0.1mS/CM Accuracy: ±2% of the reading TDS Test Range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0ppt Resolution: 1ppm; 0.1ppt Accuracy: ±2% of the reading Salinity Test Range: 0.00 to 25.00% Resolution: 0.01% Accuracy: 0.01-5.00% (±0.1%) 5.10-25.00% (±1%) pH Test Range: 0.01-14.00pH Resolution: 0.01pH Accuracy: ±0.05pH Temperature Compensation: Automatic Temperature Compensation (ATC) Working Environment: 0 to 60.0? (32.0-140?); RH 100% TDS Factor: 0.4 to 1.0 Temperature Range: 0.1-60.0? 32.0-140? Temperature Accuracy: ±0.5? Temperature Resolution: 0.1?/? Automatic Power-off: 5 Minutes Display: Support Backlight Waterproof Grade: IP67 Power Consumption: 2.9mA, power consumption for shutdown is 0 Feature: Within 150ppt, the accuracy is relatively accurate, while above 160ppt, the deviation is relatively large Battery: 3 x LR44 Button Battery (Not Included) Display Screen Size: Approx. 33 x 24 mm / 1.3 x 0.9 in Product Size: Approx. 183 x 37 x 37 mm / 7.2 x 1.5 x 1.5 in Weight: Approx. 162g / 5.7oz Package List: 1 x Water Quality Tester (Battery Not Included) 1 x User Manual