The Deep Six Hydrometer is calibrated and tested for accuracy using advanced testing procedures. With its durable construction and easy-to-read scales, the deep six is guaranteed to provide years of reliable performance.
The Kent Marine Hydrometer makes measuring aquarium water salinity very simple. Its precision and compact design provides accurate readings that aquarists of any level can understand. Accuracy to 0.001 specific gravity units (Certified calibration).
The Coralife Biocube Mini Hydrometer can remain submerged inside your aquarium, so you can check your salt level at a glance. Compact design allows for discreet placement in your aquarium. Ideal for saltwater aquariums and sump applications.