The Sera Marin Hydrometer is a reliable tool designed for measuring the salinity and specific gravity of saltwater aquariums. Engineered for precision, it helps marine aquarists maintain the ideal environment for fish, corals, and invertebrates by ensuring accurate salt concentration.

Key Features:

• Accurate Readings: Provides quick and reliable measurement of salinity (ppt) and specific gravity (SG)
• User-Friendly Design: Large, easy-to-read scale with clearly marked zones for safe salt levels
• Stable Base: Wide base allows stable positioning inside or outside the aquarium
• Durable Material: Made from high-quality, saltwater-resistant plastic for long-term use
• No Batteries Required: Operates purely through buoyancy and gravity—no electronics involved

Material:

• Clear, impact-resistant plastic
• Built to withstand marine conditions without clouding or cracking

Usage:
Simply fill the hydrometer with tank water and place it on a flat surface. Wait a few moments for the needle to settle, then read the salinity or specific gravity value. For best results, rinse with fresh water after each use.

Measurement Range:

• Salinity: 0–40 ppt
• Specific Gravity: 1.000–1.030

Ideal For:

• Marine and reef aquariums
• Routine salinity checks during water changes or top-offs
• Hobbyists aiming to maintain stable, healthy saltwater conditions