Versatile swing-arm hydrometer accurately measures both specific
gravity and water temperature. Clever design allows periodic or
continuous reading of the most important water quality parameter
in saltwater aquariums. Measure from 1.010 to 1.030 specific
gravity and 64-97°F. Please click on "More Information" for
directions, specific gravity conversion charts, and salinity
information. |Directions for Use Continuous Real-time
Measurement Hydrometers, Salinity, Specific Gravity, &
Temperature The most basic water quality parameter in a
saltwater aquarium is the Salinity, which is a theoretical
measure of the amount of salt contained within a volume of
water, normally expressed as grams per liter (g/l) or parts per
thousand (ppt). (Note: Salinity should not be confused with
manufacturer's instructions for the preparation of artificial
seawater expressed in g/l or lb/gal.) Unfortunately, it is not
possible to measure Salinity directly. However, it has a
temperature-dependent relationship with Specific Gravity, w