Feature:Multi-functional water quality test pen, which can measure PH/Salinity/Temperature/TDS/EC. It is a waterproof water quality test pen with five functions. It has high performance, pen design and fast numerical value.Specification:Conductivity test range: 0 to10000uS/cm, 10.01-19.99ms, 20.1-400mS/CMResolution: 1uS/cm; 0.1mS/CMAccuracy: 2% of reading test range: 0 to 1000ppm, 1000ppm to 10000ppm, 10.1 to 200.0pptResolution: 1ppm; 0.1pptAccuracy: 2% of readingSalinity (Salinity) measuring range: 0.00 to 25.00%Resolution: 0.01%Accuracy: 0.01-5.00% (0.1%), 5.10-25.00% (1%)pH test range: 0.01-14.00pHResolution: 0.01pH Accuracy: 0.05pHTemperature compensation: Automatic temperature compensation (ATC)Working environment: 0 to 60.0C (32.0-140F); RH 100% factor: 0.4 to 1.0Temperature range: 0.1-60.0C 32.0-140FTemperature accuracy: 0.5Temperature resolution: 0.1/Auto power off: 5 minutes 3x1.5LR44Display size: about 33*24mmDisplay: Support backlightWaterproof rating: IP67Power consumption: 2.9 mA, power consumption at shutdown is 0.The accuracy within 150ppt is more accurate, the deviation above 160ppt is larger.Package Includes:1*Water Quality Monitor (Battery and correcting powder are not included.)