Kent Marine Hydrometer is an easy-to-read, - precise to 0.001 specific gravity units. It is designed to reduce excess bubbles and provides temperature-correct readings.
The new KENT Marine Hydrometer makes measuring aquarium water salinity simple. Its precision and compact design provides accurate readings that aquarists of any level can understand.Certified Calibration that accurately measure aquarium salinity +0.001 (specific gravity units). An Easy Way to Gauge Aquarium Salinity at a Glance Accuracy to 0.001 specific gravity units. Recommended specific gravity for most marine aquariums is between 1.021 and 1.023. Recommended specific gravity for most reef aquariums is between 1.024 and 1.026.