Высокоточный цифровой рН-метр в виде ручки для воды

1* Turn on pH meter
2* Immerse the electrode in pH 6.86 standard buffer solution (under the temperature of 25 ℃)
3* After digit stabilized, press the "CAL" button for 5 seconds (the instrument comes into the automatic calibration status) wait until the display digit is 6.86 pH, then complete pH 6.86 point calibration
4* Clean the electrode with distilled water and dry it filter paper, immerse the electrode in pH 4.00 standard buffer solution

5* After digit stabilized, press "CAL" button for 5 seconds, wait until the digit is 4.00 pH, complete the pH 4.00 point calibration
6* Clean the electrode with distilled water and wipe clean the spare water, put the electrode in the pH 9.18 standard solution until the date stable, the data will be in 9.17pH - 9.19pH, the data is in the range of allowable error
7* This instrument calibration work is completed after all steps