What is used to clean the tip?

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Multiple Choice

What is used to clean the tip?

Explanation:
Cleaning a tip means removing contaminants without leaving residues that could affect future measurements. An alcohol wipe is the best choice because it sanitizes effectively and evaporates quickly, leaving the tip dry and ready for use. Water can introduce moisture and dissolved minerals, while soap can leave surfactant residues that might contaminate samples. A cleaning spray can leave droplets or residues and often requires additional rinsing. Using an alcohol wipe (typically 70% isopropyl alcohol) provides disinfection with minimal residue, making it the most reliable option.

Cleaning a tip means removing contaminants without leaving residues that could affect future measurements. An alcohol wipe is the best choice because it sanitizes effectively and evaporates quickly, leaving the tip dry and ready for use. Water can introduce moisture and dissolved minerals, while soap can leave surfactant residues that might contaminate samples. A cleaning spray can leave droplets or residues and often requires additional rinsing. Using an alcohol wipe (typically 70% isopropyl alcohol) provides disinfection with minimal residue, making it the most reliable option.

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