Hisionlee TDS Electronic Water Tester LCD Screen Water Quality Testing PH Tester High Accuracy with Automatic Temperature Compensation (TDS+PH)

TDS pen (standard range)
""0-50"" ideal drinking water
""50-100"" mineral water
""100-200"" hard water
""200-400"" acceptable running water
""400-500"" poor state
""> 500 "" The maximum contaminant levels specified from U.S.EPA
(Influence test Factors of TDS value)
Water temperature: TDS pen can not be used to measure the temperature of water. Such as hot water
Water flow rate: TDS pen can not be used to measure a large body of water sloshing.
Regional: Each different regions, cities, due to the different pipes and water, TDS value will be different.
PH Taster
Calibration methods:
1. An appropriate amount of 6.86 / 4.00 and 9.18 standard buffer solution were poured into clean different beaker, mix in 250ml distilled water.
2. Touch the ON / OFF button, turn on the power.
3. Place the electrode insert PH6.86 standard buffer solution and shake gently until the display value is stable.
4. Press "CAL" key (in 6.86 solution), for about 5 seconds, the instrument enters the automatic calibration until the displayed value to the standard buffer solution PH values, the 6.86-point calibration is complete.
5. Rinse the electrode, the electrode into PH4.00 standard buffer solution and shake gently until the display value is stable.
6. Double-click the "CAL" key (in 4.00 solution), with steps 4, complete PH4.00 point correction.
7. Rinse the electrode, and using a filter paper to dry water attached to the electrode, the electrode placed PH9.18 standard buffer solution and shake gently until the display value is stable, the displayed value within tolerance range.