Fill the DensiTower to the top of the inner tube with the water to be tested, place the hydrometer into the water slowly. Excess water flows into the outer ring. After use, remove the hydrometer and empty the DensiTower. Caution: water flows from inner tube and outer ring simultaneously.

To determine the exact density, we recommend the use of the Aqua Medic DensiMeter.
(not included)