Sg question

[Reefplumber13]

So this tank has been nothing but trouble.
I test my sg at home with a refractometer it reads 1.026 I put reg ro water on it and it reads 0.
Take some to the lfs and it reads 1.040 they put ro on it and it reads 0. What are the chances of mine being broken?

 

[ichthyoid]

“What are the chances of mI ne being broken?”

?- is that supposed to read mine ?

 

[Steve Burton]

I use calibration solution to calibrate mine at 35ppt, 1.026.

 

[hzheng33]

So this tank has been nothing but trouble.
I test my sg at home with a refractometer it reads 1.026 I put reg ro water on it and it reads 0.
Take some to the lfs and it reads 1.040 they put ro on it and it reads 0. What are the chances of mI ne being broken?

This happened to my manual refractometer before and I can definitely relate. That’s why now I have a digital refractometer and tropic Marin hydrometer

 

[project1004]

Specific gravity using refractometer should and need to be calibrated time to time. Even better if you have extra ones to compare to.

From my understanding; SG need to be calibrated to the temperature of the sample for accurate reading, compare to PPT does not matter with the temperature. I have both digital one and handheld one in case of fluctuation if it happens. I check twice when I make large changes to the tank like adding rocks or sand etc.


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[hzheng33]

I would also add that I have calibrate my original/defective refractometer using the calibration solution and it still remained inaccurate

 

[Reefplumber13]

“What are the chances of mI ne being broken?”

?- is that supposed to read mine ?

Yes I'm sorry

 

[Doberman13]

I have had an amazon refractometer that no matter how it was calibrated it would read off. I had to take it up to Rit at @atlantaaquarium and he confirmed it was a bad refractometer.

 

[Atalien2005]

I’ve had the same thing happen as well. It turned out the calibration solution was causing the problem. I found a thread on R2R to make my own solution and have used that without problems.

 

[Reefplumber13]

I’ve had the same thing happen as well. It turned out the calibration solution was causing the problem. I found a thread on R2R to make my own solution and have used that without problems.

Would you happen to have the link?

 

[york1]

http://reefkeeping.com/issues/2004-06/rhf/index.php

 

[Atalien2005]

Would you happen to have the link?

York1 posted the link to Randy Holmes original thread. I’ve also added the link from R2R with some additional discussions.

DIY Salinity calibration solutions

Randy, In light of another post on calibrating a conductivity meter, I decided to give it all a shot on my own system. I read through your article on DIY salinity calibration (http://www.reefkeeping.com/issues/2004-06/rhf/) and have a few questions for my simple brain. 1. Is the Brand MORTON...

www.reef2reef.com

 

[ecoreefguy]

I just like my Hanna handheld. Seems to be the most accurate and stable of all the methods

 

[jcook54]

I've loved my Hanna Handheld too. I still test with a freshly calibrated Refractometer to make sure things are all in line once in a while but 95% of my readings are done with the Hanna. It could be the refractometer but I've never personally had one be that far off.

 

[Reefplumber13]

It was in fact the refractometer. It was off by a lot. Got a new one in today and a hydrometer and both read the same and are reading high

 

[Reefplumber13]

OK so I added fresh water and my sg is at 1.023 I want it at 1.025-026 would 1/2 a cup bring it up more or should I do less