Lutron Electronics WA-2017SD Operation Manual page 20

* After the above a, b, c screen is selected, then cooperate
the relative standard solution, for example the
b screen should cooperate the pH 7.00 standard solution.
a screen should cooperate the pH 4.00 standard solution.
Press the " Enter Button " ( 3-4, Fig. 1 ) will
save the calibration data and finish the calibration
procedures.
* If select the d screen, press the " Enter Button " (
3-4, Fig. 1 ) will clear existing calibration data.
7) The complete procedures should execute
the two calibration points :
PH7 calibration
PH4 calibration ( or PH10 calibration )
* The calibration procedures should execute start from
pH7 calibration then follow pH4 ( or pH10 ) calibration.
* Rinse the electrode with distilled water again when
make each point calibration ( pH7, pH4 or pH10 ).
* Repeat above two points procedures two times at least.
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