A pH meter is used to test the pH of a solution.See the figure below. 
How is the solution classified?
Definitions:
Difficulty Learning
Challenges or obstacles faced when attempting to acquire new knowledge, skills, or abilities, which can vary widely among individuals.
Read
The act of interpreting or understanding the meaning of symbols, words, or sentences.
Identifying Colors
The ability to recognize and name colors, an essential aspect of visual perception.
Sleep Cycle
A series of stages that occur in a repeating pattern during sleep, including REM (rapid eye movement) and non-REM stages, crucial for restorative rest.
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