Saltwater Aquarium Salinity Hydrometer

Check salt levels during your marine-aquarium routine with a swing-arm hydrometer. Separate salinity and specific-gravity scales give you two readings from the same water sample.

✅ Follow salt levels between water changes - A salinity scale gives you a reading to compare during routine aquarium care.

✅ Read both measures in one tool - Salinity and specific-gravity scales sit alongside the swing-arm pointer for a shared reference.

A Simple Check for Your Saltwater Routine

Fill the hydrometer as directed and place it on a level surface before reading the pointer. Bubbles on the swing arm can affect the result, so remove them before recording the measurement.

Rinse with fresh water after each use to help prevent salt deposits around the pointer. The clear plastic body makes the scale visible; use the aquarium inhabitants' actual requirements when interpreting the reading.

Technical details

• Salinity scale: 0 to 40 ppt
• Specific-gravity scale: 1.010 to 1.030
• Clear plastic body
• Swing-arm pointer
• Two body-style options
• Includes hydrometer and stick

Keep a salinity check close to your aquarium-care supplies.