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 thoroughly 5-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 indicator Light 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/CM Resolution:1uS/cm;0.1mS/CM Accuracy:2% of reading Tds testing range:0 to 1000ppm,1000ppm to 10000ppm,10.1 to 200.0ppt Resolution:1ppm;0.1ppt Accuracy:2% of readin Salinity 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:0.01-14.00pH Resolution:0.01pH Precision:0.05pH Temperature compensation:Automatic temperature compensation(ATC) Working environment:0 to 60.0 (32.0 to 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 / Automatic shutdown:approximately 5 minutes 3x1.5LR44 Bare metal weight:90g(3.2oz) Display:Backlight support Steps for usage: 1. Pull out the electrode protection cover before use 2. Press the switch to turn on the power, then put the electrode into the test solution 3. When the value has stabilized, press the button to fix the measurement, then remove the meter and read the measurement 4. After use, press the shutdown button, clean the meter, and insert the electrode into the electrode protection cover Colour: Material:ABS Size:183x37mm Package Contents: 1 * Water quality tester (without 3x1.5V button batteries) 1 * English instruction manual Only 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.