You will need to recalibrate a digital pH meter from time to time. This is necessary to ensure that the correct readings are taken.
Each package makes a 250 ml calibration solution. Simple to use. Add 250 ml of distilled or deionized water per powder bag. Insert the digital pH meter into the water and press calibrate.
Powder has an indefinite shelf life
A simple 3-step procedure is written on the back of the package
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