User Manual

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stable and icon displays, then press < CAL >, LCD flashes

7.00 pH, calibration finishes after several seconds and then

flashes, indicating the 1

point calibration has been

finished and the 2

point calibration begins.

4.2.3. Take out pH electrode, rinse it in pure water, allow it to dry and submerge it in pH4.00

buffer solution. Stir the solution briefly and allow it to stay in the buffer solution until reading

is stable and icon displays, then press < CAL >, LCD flashes 4.00pH, calibration

finishes after several seconds and then flashes, indicating the 2

point calibration

has been finished and the 3rd point calibration begins.

4.2.4. Take out pH electrode, rinse it in pure water, allow it to dry

and submerge it in pH 10.01 buffer solution. Stir the solution briefly

and allow it to stay in the buffer solution until reading is stable and

icon displays, then press < CAL >, LCD flashes 10.01pH,

calibration finishes while displaying a stable pH and temperature value. icon

appears on the screen, indicating 3 points calibration has been finished. See picture (4-1).

4.2.5. Notes:

(a) The meter can perform 1 point, 2 points or 3 points of automatic calibration. When the 1

point calibration finished, press < ENTER > key to confirm and enter measuring mode.

icon for one-point calibration will appear on the lower left corner of the LCD. When the

desired measuring accuracy is ≤±0.1pH, choose one kind of buffer solution according to the

measuring range and then proceed with one-point calibration.

(b) When the 2nd calibration finishes, press < ENTER > key to confirm 2 points calibration

and enter into measuring mode. Icons or for 2 points calibration will appear on

the lower left corner of the LCD. If measurement is within acid range, you can choose pH4.00

and pH7.00 for calibration. If the measurement is within alkalinity range, you can choose

pH7.00 and pH10.01 for calibration.

measuring range is wide, the electrode is ageing, or the electrode has been inactive for a