You can test Zobo Water using a Hydrogen test H2 Blue

H2Blue is a reagent (liquid) which can be used to demonstrate the antioxidant capacity of hydrogen-rich water. When the drops are placed into water containing dissolved molecular hydrogen, the blue drops turn clear. H2Blue can also be used to measure dissolved hydrogen levels in parts per million (mg/L) using the included graduated beaker. One 10mL bottle contains approximately 450 drops, enough to do approximately 100 hydrogen-level measurements.