EZ-9909 is a multifunctional water quality pen product that can measure pH, TDS solubility, EC conductivity, salinity and temperature. It is a waterproof water quality test pen with high performance, pen-shaped design, fast numerical stability and accurate calculation results.Parameters: TDS measurement range: 0-1000ppmEC measurement range: 0-10000US/cmPH measurement range: 0.01-14.00pHSalinity measurement range: 0.00-25.00%Seawater salinity measurement range: 10.1-200.0ppt.Accuracy: 0.01-5.00% (0.1%)5.01-25.00% (1%)Display size: 33*24mmDimensions and weight: 183*37*37mm (7.2*1.5*1.5in)/90g (3.2oz)Weight: 170gDisplay: Support backlightWaterproof rating: IP67[High Precision] The high-precision algorithm chip and electrodes of our digital water pH tester ensure accurate and fast response. When the measured value is stable, just press the HOLD/TEMP key to lock the measured value and take it out for viewing, which is very simple.[Two Salinity Meters] The digital pH meter can detect the salinity of edible salt. At the same time, it can detect the salinity of seawater. Food salinity measurement range: 0.00-25.00%, seawater salinity measurement range: 10.1-200.0ppt[Auto-off function and large screen display] The PH tester has a backlit LCD to help you see the measurement results clearly in any situation. The auto-off function turns off the power after 5 minutes, saving power without any operation. A fully transparent liquid crystal (LCD) is used to display 4-digit values and the corresponding physical quantity units.[Automatic temperature compensation] Temperature may affect the reading level. The range of the digital hydroponic PH meter is 0C-60C (-0-140F). Automatic temperature compensation can ensure that you get the best reading, so you can rest assured to test in any environment.