What's the difference between galactometer and lactometer?

Galactometer

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Definition:

• (n.) An instrument for ascertaining the quality of milk (i.e., its richness in cream) by determining its specific gravity; a lactometer.

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Lactometer

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Definition:

• (n.) An instrument for estimating the purity or richness of milk, as a measuring glass, a specific gravity bulb, or other apparatus.

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