Go Back   Aquarium Advice - Aquarium Forum Community > Saltwater and Reef > Saltwater & Reef - Getting Started
Click Here to Login

Join Aquarium Advice Today
Thread Tools Search this Thread Display Modes
Please support our sponsors and let them know you heard about them on AquariumAdvice.com
Old 05-14-2009, 10:44 AM   #11
Aquarium Advice Addict
Join Date: Aug 2006
Location: not here anymore
Posts: 5,338
Originally Posted by severum mama View Post
Happy to hear it... we also have a Sybon. You're talking like 20 miles over my head so I'm satisfied that you're satisfied. :p
Not sure what part is confusing, but let's see if I can say this different...

Calibrating with pure RO/DI water will make sure your refractometer reads 1.000 when the water is at 1.000. But refractometers - even though they're far more accurate than most hydrometers - can still be off. In a perfect world, if you calibrated your refractometer to any solution with a known salinity, it would read perfect for all other salinities.

But the world ain't perfect, and there's nothing that says a refractometer has to read linear - in other words, as you move away from that calibration point, the reading may be higher or lower than reality.

Since the water we're testing isn't at 1.000 specific gravity, it's better to calibrate with a solution that is closer to what we keep our tanks at. That way, any linearity error in the refractometer is minimized. If you calibrate your unit with a 1.026 solution (the 53.0 mS solution I mentioned - can be bought at most places that sell the Pinpoint brand conductivity/salinity meters), and your water in the tank is 1.026, then you're pretty much guaranteed no error.

Like I said, I'm happy with the Sybon... but even with it, when I calibrate at 1.026, and then check 1.000 with RO/DI water, I'm about .001 high.

Kurt_Nelson is offline   Reply With Quote

hydrometer, refractometer

Please support our sponsors and let them know you heard about them on AquariumAdvice.com

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
hydrometer vrs refractometer shark55 Saltwater Fish Only & FOWLR 11 05-05-2009 02:47 PM
hydrometer jjwin98 General Hardware/Equipment Discussion 4 02-13-2007 10:44 AM
refractometer vs hydrometer guitarded Saltwater Reef Aquaria 13 11-23-2004 09:24 AM
Refractometer vs hydrometer loganj Saltwater Reef Aquaria 4 11-27-2003 08:00 PM
Refractometer vs. Hydrometer cal91666 Saltwater Reef Aquaria 3 07-18-2003 05:13 PM

» Photo Contest Winners

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -4. The time now is 12:50 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.