Low cost color coded Specific Gravity Tester™. Learn initial SG. Keep an eye on changing salt content due to naturally occurring evaporation.

Specific Gravity Tester

Checking specific gravity is the first, easiest and most often performed test for all marine fish and reef aquarium keepers.

The Marine Environment® Specific Gravity Tester™ is a quick, easy to use device to learn approximate specific gravity in all marine aquariums.

The Marine Environment® Specific Gravity Tester™ is color coded for easy reference.

Add marine aquarium water to the SGT™.  Tap gently to dislodge any air bubbles that might be attached to the swing arm.

The swing arm needle will point to your specific gravity.

Wash with clean fresh water after each use.