A pH meter is normally something that an environmentalist or chemist would use, but some gardeners also make use of it. This meter is used to measure the acidity and alkalinity of a specific liquid. pH is the measure of how many hydrogen ions are present in a solution. Although the meter is very easy to use, it must be cleaned after each time it is used to get a clear reading.Before you can begin to calibrate your pH meter, you must make sure that the probe you use was kept in a storage solution or a solution with pH 4. If you do not do this, you need to let the probe sit for at least twenty four hours in distilled water. The meter must also be set on pH mode or this will be pointless. When it is set, you should rinse it off with distilled water. To help calibrate it, it will be placed int