Check the listing for details. Alkaline Drinking Water pH Test Kit Measure pH 1-11 Liquid Indicator Solution 1. Condition: New. Listed at 17.99 USD. Hydrion UI-100 One Drop Indicator Solution for WaterTest Range 1.0-11.0 Due to the dark solution there may be discoloration of the case, chart or lid. Hydrion pH Indicator Solution kits feature specially formulated concentrated indicator solutions. Just one drop of the indicator solution added to 4 ml. of sample solution will provide an accurate ph reading, displayed in bright easy to view colors.1-11 Hydrion pH Wide Range Indicator Solution will give accurate pH readings at each full pH unit from pH 1.0-11.0. Colors will remain stable for delayed readings.The color chart has pH matches at [1.0][2.0][3.0][4.0][5.0][6.0][7.0][8.0][9.0][10.0][11.0]Each kit contains one(1) polyethylene dropper bottle with 24 ml. of pH indicator solution, one(1) capped 4 ml. sample tube, and a laminated color chart, packed in a polypropylene protective case. Place one drop of the indicator solution into 4 ml. of sample solution. Match the color change directly to the laminated color chart for quick and easy pH measurement.