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

Measuring range 0.0-14.0PH.
Resolution 0.1 pH.
Accuracy ± 0.1pH.
Automatic temperature compensation 0 ℃ -55 ℃.
Power 3 × 1.5v (AG-13 button type batteries).
Use of the environment 0 ~ 50 ℃ RH <95%.
Volume 152 × 29 × 15mm.
Weight 50g.
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.