We do in your water demonstrations these drops are vital to show how the properties of the water are changing from a neutral pH to a higher alkaline pH.
Put your pH indicator drops in the top of your chamber after you have added your water. Plug in your Mini Demo Ionizer and watch as your water is separated into each side of the chamber due to electrolysis process happening right before your eyes.
Be sure to stock up on pH measuring drops. These are also a great addition for pH measurement in drinking water, aquariums or fish tanks, and other aqueous solution in which the solvent is water.