skaitmeninis PH matuoklis ph Matuoklis PH testeris SmartSensor AS218 0.0014.00pH Drėgmės matavimo prietaisas vandens PH rūgštingumo matuoklis

 the preparation of the buffer solution1. PH4 buffer solution with accessories distribution of  powder in 250 ml distilled water, fully dissolved  dilution 30 minutes.2. PH6.86 buffer solution with accessories distribution  of powder in 250 ml distilled water, fully dissolved  dilution 30 minutes.3. PH9.18 buffer solution with accessories distribution  of powder in 250 ml distilled water, fully dissolved  dilution 30 minutes.