A digital
pH meter is a handheld device with a small console and probe attached that measures whether a substance is acidic or alkaline in nature. Many people perform pH testing on themselves for health reasons, to ensure the body isnt overly acidic. A pH level that is too acidic can affect your body in many ways, including bone loss, according to the NASAs Food for Thought program. Your pH level can be measured with strips that turn a certain color to let you know the pH, but a digital meter will usually give a more accurate reading
Pour a 1-inch depth of distilled water into a clean 100- or 250-mL beaker.
Uncap the meter and place probe-down into the distilled water beaker. The meter should be placed in the distilled water between measurements to keep the probe moist.
Place the analyte solution in a small beaker. A small Erlenmeyer flask will not work because the pH meter probe will not reach to the bottom of the flask.
When ready to measure the pH of the analyte solution, remove the meter from the DW beaker, rinse the tip with distilled water from a wash bottle, and dry the probe as well as you can with a Kimwipe.
Turn the pH meter on and insert it into the analyte solution to a depth between 0.5 inches (enough to cover the probe completely) and 1 inch. If necessary, tip the beaker to enhance the liquid depth. Gently stir the solution in a circular motion with the pH meter probe, then hold the meter steady in the solution until a stable pH reading is obtained on the liquid crystal screen. Record the reading.
Turn off the meter, remove the probe from the analyte solution, rinse it with DW from a squirt bottle, and return it to the DW beaker.
When finished with your measurements, dry the probe thoroughly, cap the probe, and make sure the power is turned off. Return the
China pH meter to the storage box at the front of the lab.
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