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Hydrometers
Hydrometers
Hydrometers come in two types:
- Floaters
- Swing Needle
Hydrometers are reletively inexpensive, and very useful and helpful for any Saltwater aquarium set up. Specific gravity for your saltwater aquarium should be maintained in the range of 1.021 to 1.024.
Floater
This was the original design hydrometer for saltwater aquarium and looks like a large floating thermometer.
The deisgn has a scale inside a long-necked tube. The level at which the tube floats depends on how much salt is in the water.
The scale is read where the water’s surface meets the equipment, but as the water movement is a lot making it diffucult to read.
Swing-Needle
The swing needle is easier to read than the floater, the deisgn is a small plastic box with a needle in it that pivots when the box is filled with aquarium water.
The needle will point to a scale, which will then tell you the specific gravity.
Swing-needles usually need to be calibrated to get accurate reading. So make sure that you follow the manufacturer’s specific instructions on how to use this equipment.
The needle can also sometimes stick. Tapping it will do the work.
This kind is also known as pointer or floating-needle.
Complete guide to saltwater aquarium maintenance and care
Text and Photo Source: Saltwater Aquarium Online Guide
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