Potential answers for "Alternative to litmus paper"

⭐⭐⭐⭐ PHSTRIP
⭐⭐⭐ ACID
⭐⭐⭐ XXXX
⭐⭐⭐ BASE
⭐⭐⭐ ACIDTEST
⭐⭐⭐ PHTEST
⭐⭐⭐ ACIDS

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