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Old 07-21-2009, 10:01 PM   #1
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Salinity

Ok so.. two questions.

1. Is the gravity the same thing as the salinity of the tank?

2. Is a refractometer and a hydrometer the same thing?
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Old 07-21-2009, 10:02 PM   #2
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1) No, salinity involves measurement dissolved stuff in the water

2) refractometer used light and a color scale and a hydrometer uses the gravity of the water to move a pointer.
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Old 07-21-2009, 10:05 PM   #3
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So.. having both a hydrometer and refractometer would take care of the salinity and gravity of the tank?
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Old 07-21-2009, 10:06 PM   #4
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Well as I understand, both devices do both things. A hydrometer has a scale for each one.

Basically they both would work but I think the refractometer is more precise.
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Old 07-21-2009, 10:07 PM   #5
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Alright. So if i got a refractometer and a hydrometer then id be wasting moeny because they are the same thing? lol. glad i didnt go ahead and do that :p


I found this on ebay.. would this be a good buy?
http://cgi.ebay.com/New-ATC-Salinity-s-g-Refractometer-4-Aquarium_W0QQitemZ200354295448QQcmdZViewItemQQptZL H_DefaultDomain_0?hash=item2ea60bee98&_trksid=p328 6.c0.m14&_trkparms=65%3A12|66%3A2|39%3A1|72%3A1205 |293%3A1|294%3A50
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Old 07-21-2009, 10:12 PM   #6
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xD yea pretty much. I mean they both are for measuring the gravity/salinity of SW so if you WANTED you could use a refractometer and use a hydrometer for redundancy.
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Old 07-21-2009, 10:19 PM   #7
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Using a refractometer provides a direct reading of specific gravity and salinity in water and automatically compensates for temperature.
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Old 07-21-2009, 10:20 PM   #8
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SG (Specific Gravity) is a measure of salinity as a ratio of density to pure water. Hydrometers measure it by weight of water and are temp dependent. Refractomers measure it by speed of light through the water. The later are much more accurate.
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Old 07-21-2009, 10:23 PM   #9
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Alrighty. Thanks for the info guys. So i think what im trying to understand here is.. i should buy either one pretty quickly so i know what all those measurements are right? Because if im starting my cycle soon then i should have that thing nearby to check the water. right?
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Old 07-21-2009, 10:25 PM   #10
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Yes. You should have it when you begin cycling. I'd recommend the refrac. Save the money and not bother with a hydro.
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