সাৰ্বজনীন যোৰাসাৰ্বজনীনভাৱে
সাৰ্বজনীন সূচক (Assamese)
1. ChemistryA universal indicator is a pH indicator made of a solution of several compounds that exhibit various smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions... from wikipedia.org