Feature: 1. The 5 in 1 multifunctional water quality tester measures PH, TDS, EC, salinity and temperature. 2. It features high performance, pen shape, fast numerical stability and accurate calculation result. 3. IP67 waterproof, this meter can still be used when dropping into the fish tank, convenient to use. 4. Replaceable probe, automatic calibration and high reliability, easy to operate. 5. The salinity can be measured. The seawater salinity is the ratio of total dissolved solids to the weight of sea salt in seawater. It is usually expressed in g/kg seawater and the measurement range is 10.1-200.0ppt. Light salt refers to light water with a salt content of less than 0.5g/L. The measurement range is 0.00-25.00% and the accuracy is 0.01-5.00%, 5.10-25.00%. Specification: Item Type: Water Quality Tester Material: ABS EC Test Range: 0 to 10000uS/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℃/℉ Battery: 3 x 1.5 LR44 Button Battery (Not Included) Automatic Power-off: 5 Minutes 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, the electrode should be cleaned after each use. 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. 160g / 5.6oz Package List: 1 x Water Quality Tester (Battery Not Included) 1 x User Manual Note: Be sure to clean the electrode after each use.