Calibrating Refractometer

[Aquattro]

Calibrate??? hmmm...

[ashr]

Originally Posted by Stones

I used to do this as well but it is much better to calibrate with a known 35 ppt solution such as the pinpoint one listed above.

Using 0 ppm RODI water to calibrate my refractometer, my salinity was acutally at 1.028 when the refractometer was reading 1.025. Didn't know this until after I had used the pinpoint solution to calibrate.

Where can I buy this?

[gregzz4]

Originally Posted by ashr

Where can I buy this?

LFS
Any solution meant to calibrate to 35ppt will do you fine

[Madreefer]

Well thanks for the replies. So is this solution only available at LFS or anywhere else? The store here would have the deer in the headlights look if I dared to ask.

[wayner]

J&L

[whatcaneyedo]

Originally Posted by Madreefer

Well thanks for the replies. So is this solution only available at LFS or anywhere else? The store here would have the deer in the headlights look if I dared to ask.

I have a bottle of it that I use to calibrate mine once a year, J&L sells it. http://www.jlaquatics.com/product/pp...+Solution.html Or just drop in some time and bring your refractometer with you.

[Madreefer]

Just in case anyones interested

http://reefkeeping.com/issues/2006-12/rhf/index.php

[Reef Pilot]

I have a Sybon refractometer, and have only used the supplied 0 ppt solution to calibrate. I have never had to adjust it. But maybe I should get some of that 35 ppt solution to double check.

[Cal_stir]

I have a sybon, I have calibration fluid and it reads the same if I calibrate it with RODI or the pure water that came with the sybon when I check it with the calibration fluid.

[Reef Pilot]

I got some 35 ppt calibration fluid yesterday, and just checked it with my Sybon refractometer. It was bang on perfect. I had previously only checked it with the supplied 0 ppt ultrapure water fluid but have never had to adjust it. Now with the 35 ppt fluid, glad to see that it is accurate at both ends.

I've had the refractometer now for over 3 years, and use it often with water changes and with my QT tank. Not sure how they can get out of calibration, but mine has stayed true the whole time.