Check the listing for details. pH & TDS Meter Combo Water Tester TDS/EC/Temp F Hydroponics,Household Drinking. Condition: New. Listed at 12.99 USD. PH Meter, TDS Meter Combo, Pool Water Test Kit, PH Tester Digital, PPM Meter, 0.01 Resolution TDS PH EC Temperature 4 in 1 Set for Drinking Water, Hydroponics, RO System, Aquarium, Swimming PH & TDS meters all are accurate, reliable and easy to use Digital pH meter works for testing water's pH, 3-in-1 TDS meter works for testing water's EC, TDS and temperatureThey are used for testing liquid's quality, such as drinking water, hydroponics, aquaculture, RO system, aquariums, swimming pools, SPA and so on. Please kindly note as below:PH meter's accuracy was improved, and it will take longer in testing.In calibrating, pressing CAL button after pH meter reads calibration solution stably.3-in-1 TDS meter was calibrated by 1413 solution in producing, does not need to re-calibrate.3-in-1 TDS meter's probe is titanium alloy, doesn't suit for testing sea water Advanced Features: · WIDE USE:It is commonly used for testing the pH balance, quality and hardness of drinking water, household water, pool water, aquarium, Spa, hydroponics etc(Any issue about this product ,pls contact with us) · THE RANGE OF MEASURE: PH resolution is 0.01pH, accuracy is ±0.01pH, measurement range is 0-14 pH. TDS meter ranges from 0~9990ppm, Conductivity ranges from 0~9990 us/cm, EC ranges from 0~9990 us/cm · ATC FUNCTION: Equipped with auto temperature compensation function, PH tester can adjust according to water temperatures and give pH readings almost instantly. Don't need to care about the temperature of test liquid · EASY TO USE: For water quality tester, pressing ''HOLD'' button for maintaining reading, pressing ''SHIFT'' button once for TDS & EC transformations, pressing ''SHIFT'' button twice for "° C / ° F" transformations · AUTO CALIBRATION: For pH tester, just place the instrument in the standard buffer and press the CAL button then it will automatically start calibration data. (This ph meter has been calibrated by factory so users can use it directly) Calibration of the pH meter 1. The calibration powder with 250ml of distilled water or pure water (Do not use tap water and mineral water) to open. Dip the pH electrode into a mixed phosphate standard buffer at pH 6.86 and shake gently 2. Push the CAL button, it will auto calibration until the displayed value and the standard buffer solution at pH 6.9 consistent with the ambient temperature. 3. The same as above, the electrode was inserted into pH4.01 Phosphorous stupid acid potassium bicarbonate standard buffer solution 4. About two minutes or so. The displayed value should be within the error tolerance compared to the pH value of the buffer solution Package list: 1XPH meter ,1X Case 3X calibration powder 1x TDS Meter,1X Case 1X instruction manual