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Hydrometer
From The Aquarium Wiki
A hydrometer is a device used to measure the specific gravity (sg) of water.
It is commonly used to measure the amount of salt in a body of water when setting up brackish or saltwater tanks. You'll want a hydrometer with a specific gravity scale of at least 1.005 to 1.030, salinity of 5 to 40.
Cheaper passive hydrometers are designed to be used at their calibrated temperature. Usually 25°C (77°F) . If you measure at different temperatures you'll have minor errors.
- For more accurate devices, see - Refractometer.
[edit] Corrections
| °F/°C | Adjust |
| 40°F (4.4°C) | -0.002 |
| 50°F (10°C) | -0.001 |
| 60°F (15.6°C) | -0.000 |
| 70°F (21.1°C) | +0.001 |
| 80°F (26.7°C) | +0.002 |
| 90°F (32.2°C) | +0.004 |
| 100°F (37.8°C) | +0.005 |
[edit] Links
- Hydrometer Temperature Corrections
- Hydrometer on Wikipedia
