Instant Ocean Hydrometer

The Instant Ocean hydrometer is a simple swing-arm tool for measuring salinity and specific gravity, the check you run every time you mix saltwater or top up a marine tank.

Key features

• Reads specific gravity and salinity at a glance
• Fill, tap out the bubbles and read the swing arm
• No batteries or calibration fluid to keep on hand
• An everyday tool for mixing and maintaining saltwater

Quick and inexpensive for routine checks; for lab-grade accuracy a refractometer is the step up. More marine salt and saltwater. Available for local pickup at our Lethbridge store.