DIRECTION:

A. PERIODIC USE:

1. First, remove the plug from the bottom of the unit. Next, place it into the outlet to prevent spillage after filling.

2. Holding the top of the unit, slowly place it into the aquarium. Water will begin to flow in through inlets 1 & 2 on the upper sides of the unit. When water flows above the water-filled conduits, you can read the specific gravity on the inside scale.  

B. CONTINUOUS USE:

1. Submerge the hydrometer approximately 15 cm (5.9 in.) below the water's surface.

2. Recommended specific gravity should read 1.020-1.023 for most marine aquariums. You must add marinemix when below this level, or add fresh water if above this level.

Note： 

1. To avoid incorrect readings resulting from bubbles that attach to the pointer, water flows in through inlets on the upper sides and then enters the hydrometer.

Bubbles will be out of the hydrometer from the inlets because of its low density.

2. Salt deposits that accumulate on the pointer will result in inaccurate readings. Please clean the hydrometer regularly (about once every 3 months).

Simply soak in a solution of lukewarm water and vinegar for approximately 30 minutes. Rinse thoroughly with fresh water.