How to Read a Hydrometer
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Pour your sample into a smooth, clear cylinder or jar that is dry or well rinsed with a portion of the sample.
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Make sure your sample is thoroughly mixed before testing.
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Immerse the hydrometer in the liquid to a point slightly below the place where it naturally floats. Make sure the hydrometer and liquid are at rest and free of air bubbles.
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Measure the temperature of the sample. Ideally, the sample temperature should be equal to the temperature standard of the hydrometer, generally 60°F. If temperature differences are unavoidable, correction tables can help to adjust readings—call our Applications Specialists for information.
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Take your reading at the point where the surface of the liquid crosses the hydrometer.