What tool determines sanitizer concentration?

• A. A pH meter
• B. A thermometer
• C. A hydrometer
• D. A test kit

Answer: (D)

Measuring sanitizer concentration is about ensuring the solution has the right amount of active sanitizer to effectively kill germs without creating safety risks. The tool designed for this is a test kit, which directly measures how much sanitizer is present, usually in parts per million or mg/L. Test kits often use colorimetric strips or a small reader that matches a color or reading to a chart, showing whether you’re within the required range.

A pH meter tells you how acidic or basic the solution is, which matters for some sanitizers but doesn’t tell you how much sanitizer is in the water. A thermometer measures temperature, which can affect sanitizer effectiveness but not its concentration. A hydrometer measures density or specific gravity, not sanitizer content. So the test kit is the best choice because it specifically quantifies the active sanitizer level.