Aquarium Systems Sea Test Hydrometers are carefully constructed devices designed to give you an accurate reading regarding the salt levels in your aquarium, letting you have the information you need to optimize salinity for your aquatic life.

The Seatest Hydrometer from Aquarium Systems is part of their excellent Sea Test range, designed to make the best of your aquarium.

This precise device will measure the specific gravity and salinity of tropical seawater and provide you with the most accurate readings.

Accurate to 0.001 SG

Sea Test TK-505 hydrometer is a veteran in marine aquarium hobby. Made of almost unbreakable acrylic, just pour some saltwater inside to directly obtain a reading of specific gravity/salinity hydrometer, this model is accurate enough for everyday quick readings on marine aquariums.

• Unbreakable and easy to clean.
• Measuring range relative density: from 1014 to 1030
• Measuring range from 20 to 40 PPT salt stability