This unit could well be the most important of meters, as it measures antioxidant activity in the liquid and gives a true indication of what it does to the body.
Increased presence of negatively charged hydrogen ions in any liquid for consumption, makes it beneficial to health and well being, see Microhydrin under nutritional formulations. In the absence of an adequate supply of these, intracellular function, communication and energy production are inhibited, toxins and free radicals accumulate and health deteriates. Tap water has minimal quantity, while fresh juices and real spring water, would have an abundance.
This unit comes with probes to test your water for acid/alkaline values, (but also can be used for most liquids), and also a 20ml satchet of calibration solution. Or if the unit is to be used often, purchase an extra container ( 185 ml ) of the solution for $7.50. As an example, if the unit is used daily, clean and recalibrate the unit (couple of minutes only) each week, you will then continue to get accurate readings.