C. Select Buffer
1. Press “SCROLL” key for 5
seconds or more to enter
“Buffer Select Mode”.
2. Press “SCROLL” key again
to select either 7.00
(7.00/4.01/10.01) or 6.86
(6.86/4.00/9.18) buffer sets.
3. Press “STORE” key for 2 seconds to exit and return to
“Measure Mode”.
Note:
There is no need to repeat this procedure every time
unless one decides to change the buffer settings.
D. Calibrate pH
1. Press “CAL” key for 2 to 3
seconds to enter
“Calibration” mode.
2. Clean and dip meter into
either pH 7.00 or 6.86
buffer solution. A ‘WAIT”
icon will flash.
3. VisionPlus pH meter will perform end point sensing to
determine when the calibration reading is stable. Meter is
calibrated when “WAIT” icon disappears, and the unit will
automatically enter the next point calibration 5 seconds
later. One point/first point calibration is now completed.
Press “CAL” key to exit or continue to next step for two
points / second point calibration.
4. Repeat Steps 2 and 3 for two points/second point
calibration by dipping the meter in pH 4.01/4.00 or
10.01/9.18 buffers.
5. Continue to next step for three points/third point
calibration or press “CAL” to exit two points calibration
mode.
6. Repeat Steps 2 and 3 for three points / third point
calibration.
7. When “WAIT” icon disappears, the unit will automatically
return to Measure Mode.
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