Professional 5 in 1 Digital Water Sampler PH/TDS/EC/Salinity/Temperature Measuring Device Pen Waterproof Multifunction MeterFeatures: Portable TDS Meter can be made anywhere to measure water quality, such as hydroponics, drinking water, tap water, RO system of water, aquarium, seawater, pool water, etc., with high accuracy algorithm chip and electrodes with our digital ph tester to ensure accurate and fast response. Once the measured value is stable, simply press the HOLD/TEMP button to lock the measured value and take it out for viewing, which is really simple. The digital pH tester has the functions of monitoring TDS, pH, salinity, EC meter and temperature measurement. Temperature can affect reading levels, the digital ph meter for water hydroponics has an even better range of 0°c-50°c (32°f-122°f), automatic temperature compensation can ensure you get the best reading, so you can test with confidence in any environment. IP67 is an international waterproof and dustproof certification. Protection against dust intrusion, short-term immersion. Specification:Material: ABS Measurement: 183x3 7mm/ 37.2x1.46 inches Conductivity Test Range: 0 to 10000uS/cm 10.01-19.99ms 20.1-400ms/cmResolution: 1uS/cm; 0.1ms/cmAccuracy: ± 2% of ReadingTds Test Range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0pptResolution: 1ppm; 0.1ppt Accuracy: ± 2% of readingSalinity 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: 0.01-14.00pHRresolution: 0.01ph accuracy: ± 0.05phTemperature compensation: Automatic temperature compensation (ATC)Operating environment: 0 to 60.0°c (32.0-140°f); RH TDS Rate: 0.4 to 1.0 Temperature Range: 0.1-60.0 °C 32.0-140 °F Temperature Accuracy: ± 0.5 °C Temperature Resolution: 0.1 °C/°F Display Ratio: Support(No)Backlight Waterproof Rating: IP67 Power Consumption: 2.9 mA, Shutdown Power Consumption is 0 The accuracy is more accurate within 150ppt and the deviation above 160ppt is relatively large. Note: you need to clean the electrode every time you use itAbout instrument calibrationEC conductivity: support automatic identification of 3-point calibration (1413us 12.88ms and 111.8ms) with 3 built-in calibration points (1413us/cm 12.88ms/cm 111.8ms/cm)PH: the calibration solution can be automatically identified in 1 point (6.86) or 2 points (6.86 4.00) (6.86 9.18) or 3 points (6.86 4.00 9.18)PH measuring rangeDescribe the details of the above selling point, attracting and ensuring the trust of its potential users. Package Included:1x Digital Water Sampler,