What is the name of the device for measuring some characteristics of a liquid, such as its density or specific gravity?
Hydrometer
The correct answer is Hydrometer.
Why the other options are incorrect: Option 2 (Lactometer): While a lactometer also measures specific gravity, it is a highly specific type of hydrometer used exclusively to test the purity and density of milk , rather than liquids in general. Option 3 (Calibrator): This is a general term for a device used to adjust, verify, or standardize the accuracy of various measuring instruments, not a specific tool for measuring liquid density. Option 4 (Alkalimeter): This is a laboratory instrument used to measure the amount of alkali (base) in a substance, or to measure the strength of alkalis, not liquid density.
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