Heathrow Scientific 6603-9 Specific Gravity Hydrometer, 3.000 to 4.000, 0.010 subdivisions, 305 mm, 1/pk
$45.42
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Precision Specific Gravity Hydrometers measure the ratio of the mass of a solid or liquid to the mass of an equal volume of distilled water. Each hydrometer has been calibrated for use at 60°F.
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