Waterproof grade:IP67. Power consumption:2.9 mA, shutdown power consumption is 0. The accuracy is relatively accurate within 150ppt, and there is a significant deviation above 160ppt. Attention:Every time you use it, be sure to clean the electrodes thoroughly5-in-1 multifunctional water quality testing pen that can measure pH, TDS solubility, EC conductivity, salinity, and temperature. It is an IP67 waterproof water quality testing pen that integrates five functions. Replaceable probe, delivery of calibration powder package, automatic calibration at 3 o'clock.Measurable salinity (sea salt/freshwater salt) and stylish design, LCD display, display support backlight, automatic temperature compensation (ATC), data hold function and low battery indicatorLight salt: Light water with a salt content less than 0.5g/L (measurement range:0.00-25.00%,accuracy:0.01-5.00% 5.10-25.00%)EZ-9909 is a multifunctional water quality pen product, which can measure pH, tds solubility, ec conductivity, salinity and temperature. It is a waterproof water quality test pen with five functions. It has high performance, pen shape design and fast numerical value. Stability and accurate calculation results.Conductivity test range:0 to 10000uS/cm 10.01-19.99ms 20.1-400mS/CMResolution:1uS/cm;0.1mS/CMAccuracy:2% of readingTds testing range:0 to 1000ppm,1000ppm to 10000ppm,10.1 to 200.0pptResolution:1ppm;0.1pptAccuracy:2% of readinSalinity measurement range:0.00 to 25.00%Resolution:0.01%Accuracy:0.01-5.00%(0.1%)5.10-25.00%(1%)PH testing range:0.01-14.00pHResolution:0.01pH Precision:0.05pHTemperature compensation:Automatic temperature compensation(ATC)Working environment:0 to 60.0 (32.0 to 140 );RH 100%TDS factor:0.4 to 1.0Temperature range:0.1-60.0 32.0-140 Temperature accuracy: 0.5 Temperature resolution:0.1 /Automatic shutdown:approximately 5 minutes 3x1.5LR44Bare metal weight:90g(3.2oz)Display:Backlight supportSteps for usage:1. Pull out the electrode protection cover before use2. Press the switch to turn on the power, then put the electrode into the test solution3. When the value has stabilized, press the button to fix the measurement, then remove the meter and read the measurement4. After use, press the shutdown button, clean the meter, and insert the electrode into the electrode protection coverColour:Material:ABSSize:183x37mmPackage Contents:1 * Water quality tester (without 3x1.5V button batteries)1 * English instruction manualOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.