Conductivity Test Range: 0 to 10,000 uS/cm 10.01-19.99 ms 20.1-400 mS/CM Resolution: 1 uS/cm; 0.1 mS/cm Accuracy: 2% of reading Tds Test Range: 0 to 1,000 ppm 1,000 ppm to 10,000 ppm 10.1 to 200.0 ppt Resolution: 1 ppm; 0.1 ppt Accuracy: 2% of reading Salinity Measuring Range: 0.00-25.00% Resolution: 0.01% Accuracy: 0.01-5.00% (0.1%) 5.10-25.00% (1%) pH Test Range: 0.01-14.00 pH Resolution: 0.01 pH Accuracy: 0.05 pH Temperature Compensation: Automatic Temperature Compensation (ATC) Working Environment: 0-60.0C (32.0-140F); RH 100% TDS Factor: 0.4-1.0 Temperature Range: 0.1-60.0 32.0-140 Temperature Accuracy: 0.5 Temperature Resolution: 0.1C/F Auto Shutdown: About 5 minutes 3x1.5LR44 Dimensions & Weight: 183*37*37mm(7.2*1.5*1.5in)/90g(3.2oz) Weight with package: 170g Display: Supports backlight Waterproof Level: IP67 Power Consumption: 2.9mA, power consumption is 0 when turned off The accuracy is relatively accurate within 150ppt, and the deviation above 160ppt is relatively large. Note: After each use, be sure to clean the electrode Selling point: This product has a five-in-one function, which can measure ph, tds, ec, salinometer and temperature Measurable salinity (sea salt/freshwater salt) Sea salt: The salinity of seawater is the ratio of total dissolved solids to the weight of sea salt in seawater, usually expressed in grams per kilogram of seawater. (Measuring range 10.1-200.0ppt) Light salt: Light water with a salt content of less than 0.5g/L (Measuring range: 0.00-25.00% Accuracy: 0.01-5.00% 5.10-25.00%) Waterproof grade: TP67 (it can still be used after falling into the fish tank) Automatic shutdown function and large screen The PH tester has an LCD screen Backlit display that allows you to clearly see the measurement in any case. The automatic shut-off function turns off the device after 5 minutes of inactivity to save energy. Uses a fully transparent liquid crystal (LCD) to display 4-digit values and their corresponding physical units of measurement. IP67 Waterproof Rating: IP67 is an international waterproof and dustproof certification. Protection against dust intrusion, short-term immersion. Wide range of uses: This water quality detector is ideal for testing water, swimming pools, aquariums, spas, hydroponics, laboratory and drinking water, etc. Quantity delivered: 1 piece lucky meet