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#1
12-27-2008, 05:46 PM
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Hydrometer vs Refractometer
Yesterday I bought a Sybon Refractometer at Red Coral and today... I am horrified!
I have been using a Coalife Deep Six Hydrometer and my readings have been between 1.025 to 1.026 and have been so for about 4 months with very little change ever since I bought a Tunae ATO. I messured the Specific Gravity with the new Sybon, my water tested out at 1.029!  I tested the purified water sample that came with it to ensure it was calibrated correctly at the factory (it was). Having the SG at this level is not fatal (obviously), but is probably partially responsible for the slower growth of some of the corals. I will lower the SG levels to 1.026 over the period of a week or more. I find it amazing that there can be a .004 difference between these two instruments. I would be interested in anyone with similar experiences.
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Rebuilding.... Concept Custom 50gal 24x24x20, herbie overflow, Radion g2, 20 gal sump, Bubble Magus NAC 7, MP10 WES, Speedwave 1320 return. 
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#2
12-27-2008, 06:43 PM
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I have the exact same hydrometer as you and bought the exact same refractomter as you yesterday as well. My salinity is .004 higher as well. Will be adding fresh water slowly now...
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#3
12-27-2008, 07:39 PM
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Double check your refractometer before you make changes. Pure water is NOT a good calibration standard for these things. Read this:
http://www.reefkeeping.com/issues/2004-06/rhf/index.php
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#4
12-27-2008, 07:40 PM
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.004 of a difference is normal between a hydrometer and a refractometer. That why refractometers are recommended. A friend of mine's hydrometer was out by .008, that is why hydrometers are not very reliable.
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One more fish should be ok?, right!!!  - Laurie
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#5
12-27-2008, 07:52 PM
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hydrometer vs refractometer
just a quick note .those refractometers have to be calibrated did you get calibration fluid? you can do it with ro water. we use swc refractometers here. great results.dan
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#6
12-27-2008, 07:59 PM
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correct me if im wrong as i dont have a refracto and i have used a friends to find out my hydro is out .0015 aprox. but are you not supposed to use distilled water to zero in a refracto?????/
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72 Gallon Bowfront Reef.. Hardware:2x250w Luminex Elite HQI Reflectors (Phoenix Hexarc Bulbs), Galaxy 2x250w Electronic ballast, Euroreef 130 Skimmer, Sedra KSP 7000 Retern... Live Stock: Pair of Hawaiian Flame Wrasse, Leopard Wrasse, Pink Streaked Wrasse, Pair True Percula Clowns, Potters Angel, African Flameback Angel, Orange Fin Tomini Tang, Yellow Assessor, Tailspot Blenny, Purple Firefish.. 45 G FW Asain Barb Community tank.
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#7
12-27-2008, 08:38 PM
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Quote:
__________________
One more fish should be ok?, right!!! - Laurie
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#8
12-27-2008, 08:45 PM
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hdro vs refractometer
yes you can use ro water to calibrate remember ro water is at 0 so look in your refractometer if its not at zero adjust the screw to bring it to 0 been doing for 10 years.dan
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#9
12-27-2008, 08:49 PM
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hydro vs refractometer
we suggest in the future have the store where you buy your refractometer calibrate it for you hope this helps.dan
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#10
12-27-2008, 09:24 PM
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Your refracto should have come with calibration fluid, I got mine at Red Coral too, same one, and mine came with it.
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180G Office Reef. Started Sept 2012 http://www.canreef.com/vbulletin/showthread.php?t=88894 62G Starfire Reef. Started Jan 2013 http://www.canreef.com/vbulletin/showthread.php?t=89988
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