brand new and high quality 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 salt Low power consumption,Automatic shutdown,The instrument will shut down automatically for 5 minutes without any operation Automatic temperature compensation function With backlight function, it can be tested at night Small size, light weight, easy to carry, can be put into a pocket The waterproof grade is IP67, at normal temperature and pressure, when the for shell is temporarily immersed in 1M water will not cause harmful effects Conductivity test range: 0 to10000uS/for cm 10.01-19.99ms 20.1-400mS/for CM Resolution: 1uS/for cm; 0.1mS/for CM Accuracy: 2% of reading Tds test range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0ppt Resolution: 1ppm;; 0.1ppt Accuracy: 2% of reading Salinity 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: 0.01-14.00pH Resolution: 0.01pH Accuracy: 0.05pH Temperature compensation: automatic temperature compensation (ATC) Working environment: 0 to 60.0C (32.0-140F); RH TDS factor: 0.4to 1.0 Temperature range: 0.1-60.0 32.0-140 Temperature accuracy: 0.5 Temperature resolution: 0.1/ Display: Support 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: Every for time you use it up, you must clean the electrode About instrument calibration Conductivity 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 range Describe 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. Thank you! Package includes: 1set Tester(as the picture shows)