Instant Ocean Full Range Hydrometer

Maintain proper salinity and keep your saltwater aquarium stable with the Instant Ocean Full Range Hydrometer.

This easy to use hydrometer provides quick and reliable readings of specific gravity, helping you ensure your tank stays within the ideal salinity range for fish, corals, and invertebrates. Designed for simplicity and consistency, it’s an essential tool for both beginners and experienced hobbyists.

Accurate salinity is critical to reducing stress on your livestock and maintaining a healthy, balanced aquarium.

What It Measures

• Specific gravity (salinity levels) in saltwater aquariums

Why It Matters

Incorrect salinity levels can lead to stress, illness, or loss of fish and invertebrates.
Regular testing helps maintain stability and prevents sudden swings that can impact your aquarium.

Perfect For

• Saltwater aquariums
• Fish-only (FOWLR) systems
• Reef tanks
• New tank setups and routine monitoring

Features

• Full range salinity measurement
• Easy to read scale
• Simple, beginner friendly design
• Reliable and consistent results

Pro Tip

For best results, pair this hydrometer with a water test kit and a quality water conditioner to fully monitor and maintain your aquarium’s water quality.