Features:EZ-9909 is a new multi-functional water quality test instrument, which can measure pH, TDS,EC, salinity value and temperature. The measurement range is large and wide, which can measure both for fresh water salinity and sea saltLow power consumptionAutomatic shutdown,The instrument will shut down automatically for 5 minutes without any operationAutomatic temperature compensation functionWith backlight function, it can be tested at nightSmall size, light weight, easy to carry, can be put into a pocketThe waterproof grade is IP67, at normal temperature and pressure, when the for shell is temporarily immersed in 1M water will not cause harmful effectsConductivity test range: 0 to10000uS/for cm 10.01-19.99ms 20.1-400mS/for CMResolution: 1uS/for cm; 0.1mS/for CMAccuracy: 2% of readingTds test range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0pptResolution: 1ppm;; 0.1pptAccuracy: 2% of readingSalinity measurement 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); RHTDS factor: 0.4to 1.0Temperature range: 0.1-60.0 32.0-140Temperature accuracy: 0.5Temperature resolution: 0.1/Display: Support backlightWaterproof rating: IP67Power consumption: 2.9 mA, shutdown power consumption is 0The accuracy is more accurate within 150ppt, and the deviation above 160ppt is relatively large.Note: Every for time you use it up, you must clean the electrodeAbout instrument calibrationConductivity EC: support 3-point calibration automatic identification (1413us 12.88ms and 111.8ms) with 3 built-in calibration points (1413us /for cm 12.88ms /for cm 111.8ms /for cm)PH: calibration solution can be automatically identified at 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 measurement rangeDescribe the details of the selling point above, attracting and providing trust to your potential users.Note:Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes:1set Tester(as the picture shows)