Kent Marine Hydrometer

The Kent Marine Hydrometer makes measuring aquarium water salinity simple. Its precision and compact design provides accurate readings that aquarists of any level can understand. Accuracy to 0.001 specific gravity units

Advanced Features Include:

Large numeric display includes sweet spot for marine and reef aquariums
Water is gently diverted to bottom, reducing air bubbles from forming
Designed to give temperature-corrected readings in warm water aquariums (68¦ - 85¦ F / 20¦ - 30¦ C)