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Dip the meter into a Phosphate Solution whose pH is known to be 6.86. If you can not find this solution then dip the meter into a liquid whose pH is known (for example, Coca Cola).
Using the screwdriver included in the packs, turn the screw on the back of the meter until the electronic display responds to the correct pH of the liquid. For example, if you drop the meter on Coca Cola, turn the screw until the display shows 2.5
The meter needs to be adjusted when a long time has elapsed since the last setting when using the meter under severe conditions (and temperatures) or when you need absolute accuracy in the measurement.
|Hydrochloric solution (HCl) 1 M|
|Saliva of a healthy person|
|Solution NaOH 1 Μ|
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