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<p><b>New page</b></p><div>A '''hydrometer '''is a device used to measure the [[specific gravity]] (sg) of water.<br />
<br />
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.<br />
<br />
Cheaper passive hydrometers are designed to be used at their calibrated temperature. Usually {{C|25}}. If you measure at different temperatures you'll have minor errors.<br />
<br />
*For more accurate devices, see - [[Refractometer]].<br />
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==Corrections==<br />
{| border=1<br />
|+Hydrometer Temperature correction<br />
|-<br />
|°F/°C||Adjust<br />
|-<br />
|{{F|40}}||-0.002<br />
|-<br />
|{{F|50}}||-0.001<br />
|-<br />
|{{F|60}}||-0.000<br />
|-<br />
|{{F|70}}||+0.001<br />
|-<br />
|{{F|80}}||+0.002<br />
|-<br />
|{{F|90}}||+0.004<br />
|-<br />
|{{F|100}}||+0.005<br />
|}<br />
<br />
<br />
== Links ==<br />
*[http://hbd.org/brewery/library/HydromCorr0992.html Hydrometer Temperature Corrections]<br />
*[[w:hydrometer|Hydrometer]] on Wikipedia<br />
[[Category:Glossary]]</div>PsiPro bot