Universal indicator color charts are used to determine the pH of a solution. These handy overhead transparency charts display the colors and pH values an indicator would create for each pH unit from 3 to 10. The charts are also available as a laminated 8 1/2? x 11? Color Chart (IS5097) and smaller chart cards (IS5099). 8 1/2? x 11? Universal Indicator pH Color Chart Overhead Transparency For use with: IS30000 Universal Indicator Solution 500 mL IS30002 Universal Indicator Solution 25 mL DOT Info: Non-regulated