- This is a professional water level tester, the operation is simple, looks fashionable, small and easy to put in your pocket. - Widely used in aquariums, Glass fish ponds, pharmaceutical research, agriculture, laboratories, water bodies, quality control and other fields. - Simple operation, high precision. - Easy and quick installation and operation. Properties: Material: ABS CE: Beach Measurement: 0 to 10,000 uS/cm 10.01-19.99 ms 20.1-400 ms/cm Resolution: 1 uS/cm; 0.1 mS/cm; Accuracy: ±2% of reading TD: Measurement Range: 0 to 1000 ppm 1000 ppm at 10,000 ppm 10.1 to 200.0 PPT Resolution: 1 ppm; 0.1 PPP Accuracy: ±2% of reading Salinity: Resolution: 0.01% Accuracy: 0.01-5.00% (±0.1%) 5.10-25.00% (±1%) PH: Measuring range: 0.01-14.00 pH Resolution: 0.01 pH Accuracy: ±0.05 pH Operating environment: 0 to 60.0℃ (32.0-140℉); RH 100% TDS Factor: 0.4-1.0 Temperature Range: 0.1-60.0℃ 32.0-140℉ < p>Temperature Accuracy: ±0.5℃ Temperature Resolution: 0.1℃/℉ Battery: 3*LR44 (not included)